private void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.name.StartsWith("Block"))
        {
            var item = collision.GetComponent <Collectible>();
            if (item && item.id != "")
            {
                inventory.Add(item.id);

                SendUpdateInventory();

                Destroy(collision.gameObject);
            }
        }
        if (collision.gameObject.name.StartsWith("Potion"))
        {
            var potion = collision.GetComponent <Potion>();
            if (potion)
            {
                stats.AddMana(potion.amount);
                Destroy(collision.gameObject);
            }
        }
    }