The first door and the quick section after it felt smart! The idea is very interesting.
Then came slimes(?), which I found unintuitive. Going through the same thing over and over again can feel a bit boring too.
(SPOILER:) Getting out was actually eazy when I ignored (in the maze section; other than white) levers. I'd like at least a pop-up in the ending. Also, the file size is pretty scary :P.
Other than that, pretty cool game :)!