diff --git a/Assets/Components/BlackHole.cs b/Assets/Components/BlackHole.cs
index b24cef0..dbd9325 100644
--- a/Assets/Components/BlackHole.cs
+++ b/Assets/Components/BlackHole.cs
@@ -6,7 +6,7 @@ using UnityEngine;
 [RequireComponent(typeof(Collider2D))]
 public class BlackHole : MonoBehaviour
 {
-    protected float spentMass;
+    public float spentMass;
 
     public float Mass {
         get {
diff --git a/Assets/Components/CameraPan.cs b/Assets/Components/CameraPan.cs
index a6bd113..cc54e37 100644
--- a/Assets/Components/CameraPan.cs
+++ b/Assets/Components/CameraPan.cs
@@ -7,28 +7,26 @@ public class CameraPan : MonoBehaviour
 {    
     public string axisName;
 
-    protected new Camera camera;
     protected Vector3? lastMousePosition;
 
     private void Start() {
         lastMousePosition = null;
-        camera = GetComponent<Camera>();
     }
 
     private void Update() {
         bool panIsPressed = Input.GetAxisRaw(axisName) != 0f;
         Vector3? currentMousePosition = null;
         if(panIsPressed) {
-            currentMousePosition = camera.ScreenToWorldPoint(Input.mousePosition);
+            currentMousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             if(lastMousePosition.HasValue) {
                 Vector3 positionDelta = lastMousePosition.Value - currentMousePosition.Value;
-                camera.transform.position += positionDelta;
-                currentMousePosition = camera.ScreenToWorldPoint(Input.mousePosition);
+                Camera.main.transform.position += positionDelta;
+                currentMousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             }
         }
         lastMousePosition = currentMousePosition;
         if(Input.GetAxisRaw("ResetCamera") > 0) {
-            camera.transform.position = new Vector3(0, 0, camera.transform.position.z);
+            Camera.main.transform.position = new Vector3(0, 0, Camera.main.transform.position.z);
         }
     }
 }
diff --git a/Assets/Components/Disappear.cs b/Assets/Components/Disappear.cs
index 7e3b81f..e5c6f5e 100644
--- a/Assets/Components/Disappear.cs
+++ b/Assets/Components/Disappear.cs
@@ -4,9 +4,15 @@ using UnityEngine;
 
 public class Disappear : MonoBehaviour
 {
-    public float health;
+    protected float _health;    
     protected Particle particle;
 
+    public float Health {
+        get {
+            return _health;
+        }
+    }
+
     protected void Awake() {
         particle = GetComponent<Particle>();
     }
@@ -16,13 +22,13 @@ public class Disappear : MonoBehaviour
     }
 
     public void ResetTimer() {
-        health = 1f;
+        _health = 1f;
     }
 
     protected void Update() {
-        health -= Mathf.Pow(particle.gameController.particleDurationConstant, particle.gameController.maxTierPresent - particle.Tier - 4) * Time.deltaTime;
+        _health -= Mathf.Pow(particle.gameController.particleDurationConstant, particle.gameController.maxTierPresent - particle.Tier - 4) * Time.deltaTime;
 
-        if(health < 0) {
+        if(_health < 0) {
             Destroy(this.gameObject);
         }
     }
diff --git a/Assets/Components/GameController.cs b/Assets/Components/GameController.cs
index 2490cab..557a2a6 100644
--- a/Assets/Components/GameController.cs
+++ b/Assets/Components/GameController.cs
@@ -13,22 +13,19 @@ public class GameController : MonoBehaviour
 
     [Header("Black Hole")]
     public GameObject blackHolePrefab;
-    public BlackHole blackHole;
 
     [Header("Particles")]
     public GameObject particlePrefab;
     public Gradient[] tierGradients;
     public RuntimeAnimatorController[] tierAnimation;
-    public List<Gravitation> simulatedObjects;
-    public int maxTierPresent;
 
-    [Header("Upgrades")]
+    [Header("Upgrade Parameters")]
     public float[] upgradePushForce;
     public float[] upgradePushRadius;
     public int[] upgradeParticleCount;
     public int[] upgradeParticleTiers;
 
-    [Header("Bought Upgrades")]
+    [Header("Bought Updates")]
     public int _levelAntig = 0;
     public int _levelMatter = 0;
     public int _levelFission = 0;
@@ -64,13 +61,31 @@ public class GameController : MonoBehaviour
         }
     }
 
+    [Header("Simulation Status")]
+    [HideInInspector]
+    public List<Gravitation> simulatedObjects;
+    [HideInInspector]
+    public int maxTierPresent;
+
     [Header("References")]
+    [HideInInspector]
     public SpawnOnMouseClick spawner;
+    
+    [HideInInspector]
     public PushOnMouseClick pusher;
+    
+    [HideInInspector]
     public CameraPan panner;
+
+    [HideInInspector]
     public MusicManager musicManager;
+
+    [HideInInspector]
     public Canvas canvas;
 
+    [HideInInspector]
+    public BlackHole blackHole;
+
     protected void Awake() {
         spawner = Camera.main.GetComponent<SpawnOnMouseClick>();
         pusher = Camera.main.GetComponent<PushOnMouseClick>();
diff --git a/Assets/Components/Gravitation.cs b/Assets/Components/Gravitation.cs
index 494593d..dff9adf 100644
--- a/Assets/Components/Gravitation.cs
+++ b/Assets/Components/Gravitation.cs
@@ -9,13 +9,9 @@ public class Gravitation : MonoBehaviour
     [Header("Config")]
     public bool isStatic;
 
-    [Header("Forces")]
-    protected Vector3 appliedForce;
-
-    [Header("Internals")]
+    [HideInInspector]
     public int positionInList;
 
-    [Header("References")]
     protected new Rigidbody2D rigidbody;
     protected GameController gameController;
 
@@ -53,7 +49,6 @@ public class Gravitation : MonoBehaviour
 
     private void Start()
     {
-        appliedForce = new Vector3(0f, 0f, 0f);
     }
 
     // O(n²)
@@ -67,6 +62,5 @@ public class Gravitation : MonoBehaviour
             if(!this.isStatic) rigidbody.AddForce(direction * force);
             if(!other.isStatic) other.rigidbody.AddForce(-direction * force);
         }
-        appliedForce = new Vector3(0, 0, 0);
     }
 }
diff --git a/Assets/Components/Hue.cs b/Assets/Components/Hue.cs
index c2c4865..9cde56c 100644
--- a/Assets/Components/Hue.cs
+++ b/Assets/Components/Hue.cs
@@ -9,7 +9,6 @@ public class Hue : MonoBehaviour
 
     protected Particle particle;
     protected Material material;
-
     protected Color color;
 
     protected void Awake() {
diff --git a/Assets/Components/Merger.cs b/Assets/Components/Merger.cs
index 3ed15d6..75f8ab7 100644
--- a/Assets/Components/Merger.cs
+++ b/Assets/Components/Merger.cs
@@ -5,13 +5,13 @@ using UnityEngine;
 [RequireComponent(typeof(CircleCollider2D))]
 public class Merger : MonoBehaviour
 {
+    public float mergeAfterSeconds;
+
+    protected bool mergeEnabled;
+    protected List<Merger> mergeCandidates;
+
     [HideInInspector]
     public Particle particle;
-    public float mergeAfterSeconds;
-    
-    protected bool mergeEnabled;
-
-    protected List<Merger> mergeCandidates;
 
     protected Collider2D Collider {
         get {
diff --git a/Assets/Components/MusicManager.cs b/Assets/Components/MusicManager.cs
index 50059bc..64abd2d 100644
--- a/Assets/Components/MusicManager.cs
+++ b/Assets/Components/MusicManager.cs
@@ -6,21 +6,22 @@ using UnityEngine;
 
 public class MusicManager : MonoBehaviour
 {
-    public AudioSource baseLayer;
     public float changeSpeed = 1f;
 
+    [BeforeStart]
+    public AudioSource baseLayer;
     [BeforeStart]
     public AudioSource[] layers;
 
+    protected bool neverStarted;
+
     protected float baseLayerTargetVolume;
     protected float[] targetVolume;
 
-    protected bool neverStarted;
-
     protected void Start()
     {
         foreach(AudioSource audioSource in layers) {
-            audioSource.volume = 0;
+            audioSource.volume = 0f;
         }
         targetVolume = new float[layers.Length];
         for(int i = 0; i < layers.Length; i++) {
@@ -40,7 +41,9 @@ public class MusicManager : MonoBehaviour
 
         if(neverStarted) {
             foreach(AudioSource layer in layers) {
-                layer.Play();
+                if(layer != null) {
+                    layer.Play();
+                }
             }
             neverStarted = false;
         }
@@ -63,19 +66,23 @@ public class MusicManager : MonoBehaviour
     }
 
     protected void Update() {
-        if(baseLayer.volume > baseLayerTargetVolume) {
-            baseLayer.volume = Mathf.Clamp(baseLayer.volume - Time.deltaTime * changeSpeed, baseLayerTargetVolume, float.PositiveInfinity);
-        }
-        else if(baseLayer.volume < baseLayerTargetVolume) {
-            baseLayer.volume = Mathf.Clamp(baseLayer.volume + Time.deltaTime * changeSpeed, 0f, baseLayerTargetVolume);
+        if(baseLayer != null) {
+            if(baseLayer.volume > baseLayerTargetVolume) {
+                baseLayer.volume = Mathf.Clamp(baseLayer.volume - Time.deltaTime * changeSpeed, baseLayerTargetVolume, float.PositiveInfinity);
+            }
+            else if(baseLayer.volume < baseLayerTargetVolume) {
+                baseLayer.volume = Mathf.Clamp(baseLayer.volume + Time.deltaTime * changeSpeed, 0f, baseLayerTargetVolume);
+            }
         }
 
         for(int i = 0; i < layers.Length; i++) {
-            if(layers[i].volume > targetVolume[i]) {
-                layers[i].volume = Mathf.Clamp(layers[i].volume - Time.deltaTime * changeSpeed, targetVolume[i], float.PositiveInfinity);
-            }
-            else if(layers[i].volume < targetVolume[i]) {
-                layers[i].volume = Mathf.Clamp(layers[i].volume + Time.deltaTime * changeSpeed, 0f, targetVolume[i]);
+            if(layers[i] != null) {
+                if(layers[i].volume > targetVolume[i]) {
+                    layers[i].volume = Mathf.Clamp(layers[i].volume - Time.deltaTime * changeSpeed, targetVolume[i], float.PositiveInfinity);
+                }
+                else if(layers[i].volume < targetVolume[i]) {
+                    layers[i].volume = Mathf.Clamp(layers[i].volume + Time.deltaTime * changeSpeed, 0f, targetVolume[i]);
+                }   
             }
         }
     }
diff --git a/Assets/Components/Particle.cs b/Assets/Components/Particle.cs
index 933b00d..6124402 100644
--- a/Assets/Components/Particle.cs
+++ b/Assets/Components/Particle.cs
@@ -34,11 +34,11 @@ public class Particle : MonoBehaviour {
         }
     }
 
-    public float Scale {
+    float Scale {
         get {
             return transform.localScale.x;
         }
-        set {
+        protected set {
             transform.localScale = new Vector3(value, value, 1);
         }
     }
diff --git a/Assets/Components/PushOnMouseClick.cs b/Assets/Components/PushOnMouseClick.cs
index 75d3090..065f4d4 100644
--- a/Assets/Components/PushOnMouseClick.cs
+++ b/Assets/Components/PushOnMouseClick.cs
@@ -4,16 +4,15 @@ using UnityEngine;
 
 public class PushOnMouseClick : MonoBehaviour
 {
-    [Header("Config")]
-    public int mouseButton;
-    public float pushForce;
-    public float pushRadius;
+    public int mouseButton = 1;
+    public float pushForce = 0;
+    public float pushRadius = 0;
 
     protected Vector3 GetWorldMousePosition() {
         return Camera.main.ScreenToWorldPoint(Input.mousePosition);
     }
 
-    void Update()
+    protected void Update()
     {
         if(Input.GetMouseButton(mouseButton)) {
             Vector3 mousePosition = GetWorldMousePosition();
diff --git a/Assets/Components/SpawnOnMouseClick.cs b/Assets/Components/SpawnOnMouseClick.cs
index 74a48b7..f583eec 100644
--- a/Assets/Components/SpawnOnMouseClick.cs
+++ b/Assets/Components/SpawnOnMouseClick.cs
@@ -5,11 +5,12 @@ using UnityEngine;
 public class SpawnOnMouseClick : MonoBehaviour
 {
     [Header("Config")]
-    public GameController gameController;
-    public int mouseButton;
-    public int spawnedTier;
-    public int spawnCount;
-    public float appliedForce;
+    public int mouseButton = 0;
+    public int spawnedTier = 0;
+    public int spawnCount = 1;
+    public float appliedForce = 0.1f;
+
+    protected GameController gameController;
 
     protected void Awake() {
         gameController = GameObject.FindGameObjectWithTag("GameController").GetComponent<GameController>();
diff --git a/Assets/Components/TempUpgradesToggler.cs b/Assets/Components/TempUpgradesToggler.cs
index de526de..e1ef89a 100644
--- a/Assets/Components/TempUpgradesToggler.cs
+++ b/Assets/Components/TempUpgradesToggler.cs
@@ -6,7 +6,11 @@ public class TempUpgradesToggler : MonoBehaviour
 {
     public GameObject upgrades;
 
-    void Update()
+    protected void Start() {
+        Debug.LogWarning("TempUpgradesToggler should not be used.");
+    }
+
+    protected void Update()
     {
         if(Input.GetKeyDown(KeyCode.P)) {
             upgrades.SetActive(!upgrades.activeSelf);
diff --git a/Assets/Components/TextFromBlackHoleMass.cs b/Assets/Components/TextFromBlackHoleMass.cs
index ac00658..6b85c7a 100644
--- a/Assets/Components/TextFromBlackHoleMass.cs
+++ b/Assets/Components/TextFromBlackHoleMass.cs
@@ -7,15 +7,15 @@ using UnityEngine.UI;
 public class TextFromBlackHoleMass : MonoBehaviour
 {
     protected Text text;
-    public BlackHole blackHole;
+    protected GameController gameController;
 
     protected void Awake() {
         text = GetComponent<Text>();
-        blackHole = GameObject.FindGameObjectWithTag("BlackHole").GetComponent<BlackHole>();
+        gameController = GameObject.Find("GameController").GetComponent<GameController>();
     }
 
     protected void Update()
     {
-        text.text = blackHole.Mass.ToString("0");
+        text.text = gameController.blackHole.Mass.ToString("0");
     }
 }
diff --git a/Assets/Components/TextFromCost.cs b/Assets/Components/TextFromCost.cs
index 70a03a1..dd3ab5a 100644
--- a/Assets/Components/TextFromCost.cs
+++ b/Assets/Components/TextFromCost.cs
@@ -12,7 +12,7 @@ public class TextFromCost : MonoBehaviour
     }
 
     public void DisplayCost(float cost) {
-        if(cost > 0) {
+        if(cost >= 0) {
             text.text = cost.ToString("0");
         }
         else {
diff --git a/Assets/Components/TextFromUnspentBlackHoleMass.cs b/Assets/Components/TextFromUnspentBlackHoleMass.cs
index d35b6cd..1ced623 100644
--- a/Assets/Components/TextFromUnspentBlackHoleMass.cs
+++ b/Assets/Components/TextFromUnspentBlackHoleMass.cs
@@ -7,15 +7,15 @@ using UnityEngine.UI;
 public class TextFromUnspentBlackHoleMass : MonoBehaviour
 {
     protected Text text;
-    public BlackHole blackHole;
+    protected GameController gameController;
 
     protected void Awake() {
         text = GetComponent<Text>();
-        blackHole = GameObject.FindGameObjectWithTag("BlackHole").GetComponent<BlackHole>();
+        gameController = GameObject.Find("GameController").GetComponent<GameController>();
     }
 
     protected void Update()
     {
-        text.text = blackHole.UnspentMass.ToString("0");
+        text.text = gameController.blackHole.UnspentMass.ToString("0");
     }
 }
diff --git a/Assets/Components/UpgradeButton.cs b/Assets/Components/UpgradeButton.cs
index 443e317..42939a8 100644
--- a/Assets/Components/UpgradeButton.cs
+++ b/Assets/Components/UpgradeButton.cs
@@ -12,10 +12,12 @@ public enum UpgradeType {
 
 public class UpgradeButton : MonoBehaviour 
 {
+    [Header("Properties")]
     public int cost;
     public int level;
     public UpgradeType type;
 
+    [Header("Sprites")]
     public Sprite cantBuySprite;
     public Sprite canBuySprite;
     public Sprite hoveredSprite;
@@ -33,9 +35,8 @@ public class UpgradeButton : MonoBehaviour
                 case UpgradeType.ANTIG: return gameController.LevelAntig >= level;
                 case UpgradeType.MATTER: return gameController.LevelMatter >= level;
                 case UpgradeType.FISSION: return gameController.LevelFission >= level;
+                default: return false;
             }
-            //ok c#
-            return false;
         }
     }