Fun idea? yes! Ads? yes! Gameplay v ads = 5 seconds v 30 seconds. I can accept frequent ads but give a little bit more game time, especially if you have someone interested in going past stage 3. I passed 50 levels, semi-auto shotgun was fun to play but still the gameplay is too short and it's annoying that you can hit objects that are off screen, especially when it's the end target and you haven't finished all of the targets.