It's a very nice concept and it feels like you put a lot of work into all these options and creature parts. However, most of them were not available and I couldn't try them. Maybe I missed something, but even after I beat level 10, I didn't unlock any new part.
I also found a bug. I reached level 11, equipped with the gorilla arms and rhinoceros skin, and for some reason I was moving extremely fast backwards, so fast that I couldn't control it anymore. I think the reason is that I got so slow that my speed got far into the negatives.