void OnTriggerEnter2D(Collider2D collider)
{
Projectile missile = collider.gameObject.GetComponent<Projectile> ();
if (missile) {
health -= missile.GetDamage ();
missile.Hit ();
playerHealth = GameObject.Find ("HealthBar").GetComponent<PlayerHealth>();
playerHealth.HealthBar();
}
if (health <= 0){
Destroy(gameObject);
Die ();
}
}