// Start is called before the first frame update
 void Start()
 {
     _gm    = GameObject.Find("Game Manager").GetComponent <U2GameManager>();
     speed += (_gm.wave - 1) * 2;
 }
 // Start is called before the first frame update
 void Start()
 {
     _gm = GameObject.Find("Game Manager").GetComponent <U2GameManager>();
 }