Wow...
First thoughts on playing was 'Suckage', but then I started getting raped by Biters Melties and Gray's. And I was like. O-M-F-G W-T-F THIS IS GREAT! After a while, it gets boring, but then again, when you get the 2nd reward slot, it peaks your interest again.
All in all, one of the funnest, most addictive games I've ever played. Also, loved the music.
Good Job, and make more.