I love the idea behind this, but I think i didnt like the repetition of the maze finding so much.. Might I suggest considering making the brain maze like a "one time" challenge for each creature that eats you? Maybe its just the initial puzzle that lets you "unlock" the creature which I found cool :) And then maybe the challenge could be that each creature has different ways of moving/controls?
Like i said, I love the idea behind this, but I think the continuous maze finding wasnt my favorite aspect.
The style is amazing though!