I was pretty surprised at how much I got into this game. I couldn't even really understand it at first. The best part was probably when I managed to get three medals on the fifth level! If it wasn't for something going wrong with my screen, I would have kept playing. While the graphics weren't that great, it was still pretty fun. I liked how there were fairly different designs.
What I also like is how you really get into this game after you understand it. Luckily, I'm not addicted to it that much. It seems to go off and on with how many waves there are in one level. I like how it's unpredictable in that sense. It could use a better name, though.