Some changes I bundled together to not break stuff

converters/full_converter_shape.tscn

@@ -1,8 +1,7 @@
 [gd_scene load_steps=2 format=3 uid="uid://c3p0jdf7416ac"]
 
-[sub_resource type="RectangleShape2D" id="RectangleShape2D_np8fu"]
-size = Vector2(32, 35)
+[sub_resource type="ConvexPolygonShape2D" id="ConvexPolygonShape2D_cfy64"]
+points = PackedVector2Array(-15, 9, -6, 15, 5, 15, 15, 9, 15, -16, -15, -16)
 
 [node name="FullConverterShape" type="CollisionShape2D"]
-shape = SubResource("RectangleShape2D_np8fu")
-debug_color = Color(0, 1, 1, 0)
+shape = SubResource("ConvexPolygonShape2D_cfy64")

game/game.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=23 format=3 uid="uid://c3rxmcwa5nqng"]
+[gd_scene load_steps=21 format=3 uid="uid://c3rxmcwa5nqng"]
 
 [ext_resource type="Script" path="res://game/game.gd" id="1_i3ly0"]
 [ext_resource type="PackedScene" uid="uid://bllsprv8orpn4" path="res://bottle/bottle.tscn" id="1_y7o2l"]
@@ -7,16 +7,14 @@
 [ext_resource type="PackedScene" uid="uid://c67lfbk4gf1ga" path="res://spawner/spawner.tscn" id="3_qwsty"]
 [ext_resource type="Texture2D" uid="uid://taojrwr7xrp4" path="res://interface/upgrade_gold.png" id="4_i557v"]
 [ext_resource type="Texture2D" uid="uid://yx3gme4q4ote" path="res://interface/upgrade_gem.png" id="5_y725k"]
-[ext_resource type="Texture2D" uid="uid://pj3ip6vlatms" path="res://converters/copper_to_silver/copper_converter.png" id="6_0jj8g"]
 [ext_resource type="PackedScene" uid="uid://beg758fa6o0cs" path="res://value/evaluator.tscn" id="6_my6nv"]
-[ext_resource type="PackedScene" uid="uid://ratkps4plkhl" path="res://converters/copper_to_silver/copper_converter.tscn" id="7_ipeok"]
 [ext_resource type="PackedScene" uid="uid://4d0al27t7axe" path="res://bottle/placeable_area.tscn" id="7_muqgj"]
 [ext_resource type="PackedScene" uid="uid://c2rlx7egl7xiv" path="res://collector/universal_collector.tscn" id="9_7op48"]
 [ext_resource type="PackedScene" uid="uid://c5w3b55aiui6c" path="res://collector/collector.tscn" id="9_evdhb"]
 [ext_resource type="Theme" uid="uid://ba5utvfhnxa5i" path="res://interface/interface_theme.tres" id="10_sayqn"]
 [ext_resource type="Texture2D" uid="uid://c8pvjgtr2ufjl" path="res://interface/upgrade_copper.png" id="11_lt33g"]
 [ext_resource type="PackedScene" uid="uid://c3kitncwpi42j" path="res://entity/coin_copper/coin_copper.tscn" id="13_4j8om"]
-[ext_resource type="PackedScene" uid="uid://qtk4tm6l367w" path="res://interface/ghost.tscn" id="16_8vhx6"]
+[ext_resource type="PackedScene" uid="uid://qtk4tm6l367w" path="res://interface/ghost/ghost.tscn" id="16_8vhx6"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_rh35r"]
 size = Vector2(240, 384)
@@ -43,13 +41,11 @@ upgrade_gem_texture = ExtResource("5_y725k")
 
 [node name="GravityFromGyro" parent="." instance=ExtResource("2_h2pfr")]
 
-[node name="Ghost" parent="." node_paths=PackedStringArray("target") instance=ExtResource("16_8vhx6")]
+[node name="Ghost" parent="." node_paths=PackedStringArray("container") instance=ExtResource("16_8vhx6")]
 process_mode = 4
 visible = false
 position = Vector2(253, 109)
-preview_texture = ExtResource("6_0jj8g")
-scene_to_instantiate = ExtResource("7_ipeok")
-target = NodePath("..")
+container = NodePath("..")
 
 [node name="Bottle" parent="." instance=ExtResource("1_y7o2l")]
 metadata/_edit_lock_ = true

interface/ghost/ghost.gd

@@ -13,6 +13,13 @@ class_name Ghost
 ## The [Instantiator] to use to spawn the ghosted item.
 @onready var instantiator: Instantiator = $Instantiator
 
+## The node which materialized entities should be attached to.
+@export var container: Node = null:
+	get:
+		return instantiator.container
+	set(value):
+		instantiator.container = value
+
 ## The [OverlapChecker] to use to see if a solid block is overlapping the ghost.
 @onready var overlap_checker: OverlapChecker = $OverlapChecker
 

interface/ghost/overlap_freer.gd

@@ -23,7 +23,9 @@ var is_overlapping_with: Array[Node2D] = []:
 		return is_overlapping_with
 	set(value):
 		for body in is_overlapping_with:
-			body.modulate = valid_color
+			# Make sure to re-modulate coins which have been collected
+			if body.is_instance_valid():
+				body.modulate = valid_color
 		for body in value:
 			body.modulate = invalid_color
 		is_overlapping_with = value

project.godot

@@ -17,6 +17,11 @@ boot_splash/bg_color=Color(0.0977035, 0.0977035, 0.10161, 1)
 boot_splash/image="res://icon.png"
 config/icon="res://media/jar_icon.png"
 
+[debug]
+
+settings/stdout/print_fps=true
+settings/stdout/print_gpu_profile=true
+
 [display]
 
 window/size/viewport_width=270