anchor.diff:      Sound laserSound = game.add.sound("laser");
   
       Sprite bullet;
  -    bulletTimer = new Timer.periodic(new Duration(milliseconds: 450), (_) {
  +    bulletTimer = new Timer.periodic(new Duration(milliseconds: 800), (_) {
         if (bullets.any((item) => !item.alive)) {
           bullet = bullets.firstWhere((item) => !item.alive)
               ..x = player.x + player.width ~/ 2
  
positive.code:         laserSound.play();
        }
      });
      
  
      if (game.isMobile) {
  
  
negative.code:     player.stop();
  
      if (game.isMobile) {
  
        if (leftButton.isDownByTouch()) {
          player.move('left');
        }
        if (rightButton.isDownByTouch()) {
          player.move('right');
        }
  
      } else {
  
        if (game.keyboard.isDown(KeyCode.LEFT)) {
          player.move('left');
        }
        if (game.keyboard.isDown(KeyCode.RIGHT)) {
          player.move('right');
        }
  
      }
  
  
  