private void OnCollisionEnter2D(Collision2D other)
    {
        DudeController player = other.gameObject.GetComponent <DudeController>();

        if (player != null)
        {
            player.ChangeHealth(-1);
        }
    }
    void OnCollisionEnter2D(Collision2D other)
    {
        DudeController player      = other.gameObject.GetComponent <DudeController>();
        int            bonusDamage = LevelManager.difficulty;

        if (player != null)
        {
            player.ChangeHealth(-1 - bonusDamage);
        }

        Destroy(gameObject);
    }
    private void OnTriggerStay2D(Collider2D other)
    {
        DudeController controller = other.GetComponent <DudeController>();

        if (controller != null)
        {
            if (DudeController.currentHealth < DudeController.maxHealth)
            {
                controller.ChangeHealth(1);
                Destroy(gameObject);

                controller.PlaySound(collectedClip);
            }
        }
    }