Great idea--i like that you get to make a bit of a beat as you upgrade your equipment. Found myself doing suboptimal builds just because i didnt want to ruin my rhythm. The scribbly pixel style is refreshing--sets it apart a bit from other games (sidenote: i dig the deceit games intro animation). I couldn't quite figure out how your health regenerates, but the rest of it was really clear. Played until i maxed out my kit and could just evaporate the waves, really well done!