I think the concept and art is amazing! I did encounter some bugs here and there with movement. At some point, whenever I pressed space as Nothing, I would go all the way up to the top of the screen. It was fixed when I pressed r to restart. I'm not sure how that bug came to be. My only gripe with the gameplay is that I never really had a reason to be/use Everything. If you ever decide to add new levels or continue working on it, I'd suggest giving everything another unique mechanic or two, along with some puzzles you need Everything for, to give people more of a reason to use/be Everything. Other then that, I really liked the game!