Everything seems to be working!

Assets/Components/BlackHole.cs

@@ -0,0 +1,45 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[RequireComponent(typeof(Rigidbody2D))]
+[RequireComponent(typeof(Collider2D))]
+public class BlackHole : MonoBehaviour
+{
+    public float Mass {
+        get {
+            return rigidbody.mass;
+        }
+        set {
+            rigidbody.mass = value;
+            Scale = Mass / Mathf.Pow(Mathf.PI, 2);
+        }
+    }
+
+    public float Scale {
+        get {
+            return transform.localScale.x;
+        }
+        set {
+            transform.localScale = new Vector3(value, value, 1);
+        }
+    }
+
+    protected new Rigidbody2D rigidbody;
+
+    protected void Awake() {
+        rigidbody = GetComponent<Rigidbody2D>();
+    }
+
+    protected void Start() {
+        Mass = 50;
+    }
+
+    protected void OnTriggerEnter2D(Collider2D other) {
+        Particle otherParticle = other.GetComponent<Particle>();
+        if(otherParticle != null) {
+            Mass += otherParticle.Mass;
+            Destroy(otherParticle.gameObject);
+        }
+    }
+}

Assets/Components/BlackHole.cs.meta

@@ -1,5 +1,5 @@
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-guid: c9b169f8058046d4fb7374586f318ae6
+guid: 2f86d0ffd697a6046a85ea2885566da9
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Assets/Components/CameraPan.cs

@@ -3,12 +3,11 @@ using System.Collections.Generic;
 using UnityEngine;
 
 [RequireComponent(typeof(Camera))]
-public class PanWithMMB : MonoBehaviour
+public class CameraPan : MonoBehaviour
 {    
-    [Header("References")]
+    public string axisName;
-    protected new Camera camera;
 
-    [Header("Internals")]
+    protected new Camera camera;
     protected Vector3? lastMousePosition;
 
     private void Start() {
@@ -17,9 +16,9 @@ public class PanWithMMB : MonoBehaviour
     }
 
     private void Update() {
-        bool mmbIsPressed = Input.GetMouseButton(2);
+        bool panIsPressed = Input.GetAxisRaw(axisName) != 0f;
         Vector3? currentMousePosition = null;
-        if(mmbIsPressed) {
+        if(panIsPressed) {
             currentMousePosition = camera.ScreenToWorldPoint(Input.mousePosition);
             if(lastMousePosition.HasValue) {
                 Vector3 positionDelta = lastMousePosition.Value - currentMousePosition.Value;

Assets/Components/GameController.cs

@@ -4,6 +4,7 @@ using UnityEngine;
 
 public class GameController : MonoBehaviour
 {
-    [Header("Global Variables")]
+    public float gravitationConstant = 2;
-    public float gravitationConstant;
+    public int particlesToMerge = 5;
+    public int scaleMultiplier = 3;
 }

Assets/Components/Gravitation.cs

@@ -5,6 +5,9 @@ using UnityEngine;
 [RequireComponent(typeof(Rigidbody2D))]
 public class Gravitation : MonoBehaviour
 {    
+    [Header("Config")]
+    public bool isStatic;
+
     [Header("Forces")]
     protected Vector3 appliedForce;
 
@@ -16,15 +19,21 @@ public class Gravitation : MonoBehaviour
     protected new Rigidbody2D rigidbody;
     protected GameController gameController;
 
-
+    public float Mass {
-    protected float mass {
         get {
             return rigidbody.mass;
         }
-
-        set {
-            rigidbody.mass = value;
     }
+
+    public float GravitationConstant {
+        get {
+            return gameController.gravitationConstant;
+        }
+    }
+
+    private void Awake() {
+        rigidbody = GetComponent<Rigidbody2D>();
+        gameController = GameObject.Find("GameController").GetComponent<GameController>();
     }
 
     private void OnEnable() {
@@ -41,8 +50,6 @@ public class Gravitation : MonoBehaviour
 
     private void Start()
     {
-        rigidbody = GetComponent<Rigidbody2D>();
-        gameController = GameObject.Find("GameController").GetComponent<GameController>();
         appliedForce = new Vector3(0f, 0f, 0f);
     }
 
@@ -52,12 +59,11 @@ public class Gravitation : MonoBehaviour
         foreach(Gravitation other in simulatedObjects) {
             if(other.positionInList <= this.positionInList) continue;
             float distance = Vector3.Distance(this.transform.position, other.transform.position);
-            float force = gameController.gravitationConstant * this.mass * other.mass / Mathf.Pow(distance, 2);
+            float force = GravitationConstant * this.Mass * other.Mass / Mathf.Pow(distance, 2);
             Vector3 direction = (other.transform.position - this.transform.position).normalized;
-            this.appliedForce += direction * force;
+            if(!this.isStatic) rigidbody.AddForce(direction * force);
-            other.appliedForce -= direction * force;
+            if(!other.isStatic) other.rigidbody.AddForce(-direction * force);
         }
-        rigidbody.AddForce(appliedForce);
         appliedForce = new Vector3(0, 0, 0);
     }
 }

Assets/Components/Merge.cs

@@ -1,65 +0,0 @@
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-
-[RequireComponent(typeof(CircleCollider2D))]
-public class Merge : MonoBehaviour
-{
-    [Header("Config")]
-    public GameObject mergeIntoPrefab;
-    public bool setMergedMassFromTotal;
-
-    [Header("References")]
-    protected new CircleCollider2D collider;
-
-    [Header("Internals")]
-    protected List<Merge> mergeables;
-
-    private void Start()
-    {
-        collider = GetComponent<CircleCollider2D>();
-        mergeables = new List<Merge>();
-        mergeables.Add(this);
-    }
-
-    private void OnTriggerEnter2D(Collider2D other) {
-        Merge otherMerge = other.GetComponent<Merge>();
-        if(otherMerge != null) {
-            mergeables.Add(otherMerge);
-            if(CanMerge()) DoMerge();
-        }
-    }
-
-    private void OnTriggerExit2D(Collider2D other) {
-        Merge otherMerge = other.GetComponent<Merge>();
-        if(otherMerge != null) {
-            mergeables.Remove(otherMerge);
-        }
-    }
-
-    protected bool CanMerge() {
-        return mergeables.Count >= 5;
-    }
-
-    protected void DoMerge() {
-        GameObject mergeResult = Instantiate(mergeIntoPrefab, transform.position, Quaternion.identity);
-        MergedInfo mergedInfo = mergeResult.AddComponent<MergedInfo>();
-        mergedInfo.mergedCount = mergeables.Count;
-
-        foreach(Merge merged in mergeables.ToArray()) {
-            Rigidbody2D mergedBody = merged.GetComponentInParent<Rigidbody2D>();
-            if(mergedBody != null) {
-                mergedInfo.mergedMass += mergedBody.mass;
-            }
-            Destroy(merged.transform.parent.gameObject);
-        }
-        
-        if(setMergedMassFromTotal) {
-            Rigidbody2D mergeRigidbody = mergeResult.GetComponent<Rigidbody2D>();
-            if(mergeRigidbody != null) {
-                mergeRigidbody.useAutoMass = false;
-                mergeRigidbody.mass = mergedInfo.mergedMass;
-            }
-        }
-    }
-}

Assets/Components/MergedInfo.cs

@@ -1,9 +0,0 @@
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-
-public class MergedInfo : MonoBehaviour
-{
-    public int mergedCount;
-    public float mergedMass;
-}

Assets/Components/Merger.cs

@@ -0,0 +1,57 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[RequireComponent(typeof(CircleCollider2D))]
+public class Merger : MonoBehaviour
+{
+    public Particle particle;
+    protected List<Merger> mergeCandidates;
+
+    protected Collider2D Collider {
+        get {
+            return particle.mergeCollider;
+        }
+    }
+
+    protected int ParticlesToMerge {
+        get {
+            return particle.gameController.particlesToMerge;
+        }
+    }
+
+    
+    protected void Awake() {
+        particle = GetComponentInParent<Particle>();
+    }
+
+    protected void Start() {
+        mergeCandidates = new List<Merger>();
+    }
+
+    private void OnTriggerEnter2D(Collider2D other) {
+        Merger otherMerger = other.GetComponent<Merger>();
+        if(otherMerger == null) return;
+        Particle otherParticle = otherMerger.particle;
+        if(this.particle.Tier != otherParticle.Tier) return;
+        mergeCandidates.Add(otherMerger);
+        if(CanMerge()) DoMerge();
+    }
+
+    private void OnTriggerExit2D(Collider2D other) {
+        Merger otherMerger = other.GetComponent<Merger>();
+        if(otherMerger == null) return;
+        mergeCandidates.Remove(otherMerger);
+    }
+
+    protected bool CanMerge() {
+        return mergeCandidates.Count >= ParticlesToMerge;
+    }
+
+    protected void DoMerge() {
+        particle.Tier += 1;
+        foreach(Merger merged in mergeCandidates.ToArray()) {
+            Destroy(merged.particle.gameObject);
+        }
+    }
+}

Assets/Components/Particle.cs

@@ -0,0 +1,52 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+
+[RequireComponent(typeof(Rigidbody2D))]
+[RequireComponent(typeof(Collider2D))]
+[RequireComponent(typeof(Gravitation))]
+public class Particle : MonoBehaviour {
+    protected int _tier = 0;
+
+    public new Rigidbody2D rigidbody;
+    public Gravitation gravitation;
+    public GameController gameController;
+    public Merger merger;
+    public Collider2D particleCollider;
+    public Collider2D mergeCollider;
+
+    public int Tier {
+        get {
+            return _tier;
+        }
+        set {
+            _tier += 1;
+            Scale *= gameController.scaleMultiplier;
+        }
+    }
+
+    public float Scale {
+        get {
+            return transform.localScale.x;
+        }
+        set {
+            transform.localScale = new Vector3(value, value, 1);
+        }
+    }
+
+    public float Mass {
+        get {
+            return Mathf.Pow(gameController.particlesToMerge, Tier);
+        }
+    }
+
+    protected void Awake() {
+        rigidbody = GetComponent<Rigidbody2D>(); 
+        gravitation = GetComponent<Gravitation>();
+        gameController = GameObject.Find("GameController").GetComponent<GameController>();
+        merger = GetComponentInChildren<Merger>();
+        particleCollider = GetComponent<Collider2D>();
+        mergeCollider = merger.GetComponent<Collider2D>();
+    }
+}

Assets/Components/Particle.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 14169e6aef16b684f869320425c986ab
+MonoImporter:
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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Assets/Components/ZoomWithScrollWheel.cs

@@ -5,11 +5,9 @@ using UnityEngine;
 [RequireComponent(typeof(Camera))]
 public class ZoomWithScrollWheel : MonoBehaviour
 {
-    [Header("Config")]
     public float zoomMultiplier;
     public string zoomAxisName;
 
-    [Header("References")]
     protected new Camera camera;
 
     void Start()
@@ -19,7 +17,7 @@ public class ZoomWithScrollWheel : MonoBehaviour
 
     void Update()
     {
-        float mouseWheel = Input.GetAxis(zoomAxisName);
+        float mouseWheel = Input.GetAxisRaw(zoomAxisName);
         if(mouseWheel != 0) {
             camera.orthographicSize = Mathf.Clamp(camera.orthographicSize - mouseWheel * zoomMultiplier, 0, float.PositiveInfinity);
         }

Assets/Prefabs/BlackHole.prefab

@@ -1,6 +1,6 @@
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@@ -8,38 +8,40 @@ GameObject:
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   m_IsActive: 1
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   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
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+  m_GameObject: {fileID: 2084275844800580026}
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: -2.31, y: -0.09, z: 0}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
-  m_LocalScale: {x: 1.5, y: 1.5, z: 1.5}
+  m_LocalScale: {x: 1.5, y: 1.5, z: 1}
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+  m_GameObject: {fileID: 2084275844800580026}
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+  m_Color: {r: 1, g: 1, b: 1, a: 0.15686275}
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@@ -83,19 +85,19 @@ SpriteRenderer:
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   m_MaskInteraction: 0
   m_SpriteSortPoint: 0
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+--- !u!50 &2084275844800580024
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   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
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+  m_GameObject: {fileID: 2084275844800580026}
   m_BodyType: 0
   m_Simulated: 1
   m_UseFullKinematicContacts: 0
-  m_UseAutoMass: 1
+  m_UseAutoMass: 0
-  m_Mass: 5
+  m_Mass: 10
   m_LinearDrag: 0
   m_AngularDrag: 0.05
   m_GravityScale: 0
@@ -104,19 +106,49 @@ Rigidbody2D:
   m_SleepingMode: 1
   m_CollisionDetection: 0
   m_Constraints: 0
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Assets/Prefabs/BlackHole.prefab.meta

@@ -1,5 +1,5 @@
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Assets/Prefabs/MainCamera.prefab

@@ -98,7 +98,9 @@ MonoBehaviour:
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   m_Name: 
   m_EditorClassIdentifier: 
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+  prefabToSpawn: {fileID: 5473375028011702754, guid: e73d8e05bd7498c4a80a63094f4594a8,
+    type: 3}
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+  zoomMultiplier: 3
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Assets/Prefabs/Particle.prefab

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+  m_Name: Particle
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