Fixed debugger errors in many files and optimized some scenes/code

Levels/Interactables/Coin.gd

@@ -3,8 +3,8 @@ extends Area2D
 signal coin_grabbed
 
 
-func _on_Node2D_body_entered(body: Node) -> void:
-    if body.get_name() == 'Player':
-        emit_signal("coin_grabbed")
-        print("coin!")
-        queue_free()
+func _on_coin_body_entered(body: Node) -> void:
+    if body.is_in_group('player'):
+        emit_signal('coin_grabbed')
+        call_deferred('queue_free')
+    return

Levels/Interactables/Coin.tscn

@@ -6,7 +6,7 @@
 [sub_resource type="CircleShape2D" id=1]
 radius = 6.38067
 
-[node name="coin" type="Area2D"]
+[node name="Coin" type="Area2D"]
 script = ExtResource( 1 )
 
 [node name="Sprite" type="Sprite" parent="."]
@@ -16,4 +16,4 @@ texture = ExtResource( 2 )
 [node name="coin" type="CollisionShape2D" parent="."]
 shape = SubResource( 1 )
 
-[connection signal="body_entered" from="." to="." method="_on_Node2D_body_entered"]
+[connection signal="body_entered" from="." to="." method="_on_coin_body_entered"]

Levels/Interactables/Gem.gd

@@ -1,24 +1,11 @@
 extends Node2D
 
 
-# Declare member variables here. Examples:
-# var a: int = 2
-# var b: String = "text"
-
-
-# Called when the node enters the scene tree for the first time.
-func _ready() -> void:
-    pass # Replace with function body.
-
-
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-#func _process(delta: float) -> void:
-#	pass
-
-
-func _on_AnimationPlayer_animation_finished(anim_name: String) -> void:
+func _on_AnimationPlayer_animation_finished(_anim_name: String) -> void:
     $GemSprite.visible = false
+    return
 
 
-func _on_AnimationPlayer_animation_started(anim_name: String) -> void:
+func _on_AnimationPlayer_animation_started(_anim_name: String) -> void:
     $GemSprite.visible = true
+    return