I enjoyed the difficulty of the game, and it felt really satisfying to make progress and squeeze through the tight gaps. The gravity switching did feel very slow, but I guess this was intended and I got used to it fairly quickly.
I also enjoyed the simple art, and it does the job of looking good while also conveying information.
I don't have much to critique, other than adding a way to track progress. I have no idea how far I got, maybe something like a progress bar?
Overall though really cool game :)