Small fixes

scenes/bubbles.gd

@@ -2,17 +2,16 @@ extends GPUParticles3D
 
 
 @export var inventory: Inventory
-@export var particles: GPUParticles3D
 var tween: Tween
 
 func _on_inventory_reacted_with_gasses(gasses: Array[RuntimeSubstanceData]) -> void:
 	if tween:
 		tween.kill()
 	tween = create_tween()
-	particles.emitting = true
+	emitting = true
 	tween.tween_interval(2.)
 	tween.tween_callback(func(): 
-			particles.emitting = false
+			emitting = false
 			for gas in gasses:
 				inventory.extract_substance(gas.substance.get_formula(),gas.amount)
 	)