I absolutely loved this game! I really hope you continue to update it, my only real complaint is that the music got a bit annoying and some minor bugs, Here's some ideas though
Pros and cons to larger and smaller body parts: Add cons to making your body bigger and pros to making your enemies body smaller, maybe higher defence as currently there's almost no reason to shrink your own body or grow the enemies even though you can
Slightly more feedback: Add a bit more feel when you attack and give a better indicator of which body part took damage
More variety in rewards: I felt the reward pool was a bit lacking at times, some more would fix this!
All in all probably my favourite game I've played so far, definitely a 15/15