There are a very limited number of castles and no scoring system or choices in cannon. Because there is no scoring system, you can fire as often as you like. A few serious glitches. As the previous reviewer said, gravity sometimes shuts off and castles float instead of falling. Sometimes the level won’t end when everything is destroyed. It’s like a proof of concept version was released before it was finished. It’s too easy and repetitive. Sure, I played 800 levels while watching TV, so I hope it does get improvements and upgrades.