It was interesting getting to experiment with the different weapons as you unlocked them. It took me a while to realize the red "-12" over the weapon card meant that was what it cost to unlock it, I mistook it to mean it would unlock automatically when I got that many kills. I could see how this could be polished with more time (screen shake, particle effects, sound effects and music) and expanded out (especially more enemy types) but it's got a solid little core. Well done.