public void OnCollisionEnter2D(Collision2D collision)
    {
        GameObject collidedObject = collision.gameObject;

        if (collidedObject.tag == Player.PLAYER_TAG)
        {
            sfx.PlaySfxPowerup();
            playerGun.SpeedUpBonus();
            gameObject.SendMessage("RecycleGameObject", SendMessageOptions.DontRequireReceiver);
        }
    }