I really like the lost inside a body theme you have, though it would be really cool if you shaped the world to match a human (but maybe it is and I can't tell because I'm atomic size :P )
Would be nice to get more health drops, just to make finishing a little easier. Also, I feel off the world a lot, maybe adding lower platforms will help or maybe I just need to get good.
Also, enemy variety was good, glad there was a map and I liked all the sound effects too. Awesome job!