Do you have a cat? Do you get angry at it randomly because it is stupid? Do you enjoy Galaga? If you said yes to any of these, or even if you said no, you should go play Cat Cannon!
The trial version lets you play the first 5 levels, but the full version has infinite levels! If you have any ideas on how to make it better, shoot me an email, or post here, I will try to fix/implement it. I have nothing better to do. I will be updating it frequently with better graphics/more features and different level generating algorithms. So...what are you waiting for, go buy it! It will be awesome, I promise.