Pretty cool take on the theme!
I really liked how you made a little world to explore out of a variety of organs, it was fun to move around and fight our inner hazards in different ways. Adaptive music is great too!
On the gameplay side, playing a couple of times, the only thing I didn't get to explore as much was the 'shop' for healing/upgrades, since I was a bit slow to get enough nutrients before it was a bit late, but I think I could keep improving.
From what I played, this could even evolve into a fun teaching tool with the proper scientific backup!
Good stuff!