Fix memory leak and save file deletion + other stuff

might also be the commit where timer starts only when you move

levels/level.gd

@@ -17,6 +17,7 @@ var rings: Array[Ring] = []
 
 var finished_rings_count: int = 0
 var velocity: float = 0.0
+var has_started_playing: bool = false
 
 func _init() -> void:
 	assert(len(id) > 0, self.name + " has no id!")
@@ -69,7 +70,9 @@ func _input(_event: InputEvent) -> void:
 	var down := Input.is_action_just_pressed("gravity_down")
 	
 	if up or left or right or down:
-		started_playing.emit()
+		if !has_started_playing:
+			has_started_playing = true
+			started_playing.emit()
 		PhysicsServer3D.area_set_param(
 			get_viewport().find_world_3d().space,
 			PhysicsServer3D.AREA_PARAM_GRAVITY,