void OnTriggerEnter2D(Collider2D collider)
    {
        //Debug.Log("Hit " + collider);
        Projectile missile = collider.gameObject.GetComponent <Projectile>();

        if (missile)
        {
            health   -= missile.GetDamage();
            hitPoints = (int)health / 100;
            missile.Hit();
            healthCheck.UpdateHealth(hitPoints);
            if (health <= 0)
            {
                Die();
            }
        }
    }