refining menus and gameplay slightly

scenes/objects/game/comet.gd

@@ -2,13 +2,16 @@ extends Node2D
 
 var speed = 100
 var scene
+var active = true
 
 func _ready() -> void:
 	scene = self.get_parent()
 	
 func _process(delta: float) -> void:
-	self.position.y += speed*delta
+	active = scene.active
 	
-	if self.position.y >= 720:
+	if active:
+		self.position.y += speed*delta
+	if self.position.y >= get_viewport_rect().size.y:
 		scene.comets.erase(self)
 		self.queue_free()