Player gun, bullet and its collisiions. Refactor.

metroidvania/Scenes/Objects/Proyectile.gd

@@ -0,0 +1,20 @@
+extends Node2D
+
+var velocity = Vector2.ZERO
+
+func _process(delta):
+	position += velocity * delta
+
+
+func _on_VisibilityNotifier2D_viewport_exited(_viewport):
+	queue_free()
+
+
+func _on_Hitbox_body_entered(_body):
+	# When we collide with the world
+	queue_free()
+
+
+func _on_Hitbox_area_entered(_area):
+	# When we collide with an enemy (a hurtbox)
+	queue_free()