flutter_japFlameTutorial_flyControl.dart

...
class FlyTerminator extends Game with TapDetector {
  ...
  void spawnFly() {
    ...
    flies!.add(Fly(this, x, y));
  }
  
  void update(double t) {
    ...
    flies!.removeWhere((Fly fly) => fly.isOffScreen);
  }

  void onTapDown(TapDownDetails tapDownDetails) {
    // flies!.forEach((Fly fly) {
    //   if (fly.flyRect!.contains(tapDownDetails.globalPosition)) {
    //     fly.onTapDown();
    //   }
    // });
    for (int i = 0; i < flies!.length; i++) {
      if (flies![i].flyRect!.contains(tapDownDetails.globalPosition)) {
        flies![i].onTapDown();
      }
    }
  }
}

class Fly {
  ...

  void update(double t) {
    if (isDead) {
      flyRect = flyRect!.translate(0, game.tileSize! * 12 * t);
    }
    if (flyRect!.top > game.screenSize!.height) {
      isOffScreen = true;
    }
  }

  void onTapDown() {
    flyPaint.color = Color(0xffff4757);
    isDead = true;
    game.spawnFly();
  }
}