I really liked this game! I got to level 25 and then decided to do other things with my life. I like the way the levels just increase. Perhaps a main menu would be nice, and maybe some way to make the score system relevant or at least captured (and then maybe you can re do levels to get a better score). Also would be cool to introduce new things every 5 or 10 levels, maybe shields, things like that... just a few ideas! :)