add groups for nodes and clean up old code

src/NPCs/ooze.gd

@@ -16,23 +16,16 @@ const MOVEMENT_VECTORS = [
 func _ready():
 	pass # Replace with function body.
 
-
 # Called every frame. 'delta' is the elapsed time since the previous frame.
-func _physics_process(delta):
+func _physics_process(_delta):
 	var movement = MOVEMENT_VECTORS[randi() % 4]
 	move_and_collide(movement * 2)
 	pass
 
-
-func _on_Hitbox_area_entered(area):
-	pass # Replace with function body.
-
-
-func _on_Hurtbox_area_entered(area):
+func _on_Hurtbox_area_entered(_area):
 	$Hurtbox/death.play()
 	pass # Replace with function body.
 
-
 func _on_death_finished():
 	queue_free()
 	pass # Replace with function body.