void Update()
 {
     timerText.text     = "Time: " + (gameManager.GetTime()).ToString("N1");
     ScoreText.text     = "Pt: " + scoreManager.GetScore().ToString("N0");
     BulletBoxText.text = "BulletBox: " + gunManager.GetBulletBox().ToString();
     BulletText.text    = "Bullet: " + gunManager.GetBullet().ToString();
 }