I would like to have a bit more to the game before fighting the "final boss". Some easier enemies that teach me how to play, and what I should be doing before fighting the big boss would help me a lot.
Pretty fun, although I don't know if I could see myself replaying it as much as I would need to, to beat it. I'd definitely like to be able to used WASD controls, or remap the controls to my preferences. But all things considered good job.