Cool vibe. The art is really nice, and the idea of switching dimensions is interesting. For me it was a bit too challenging (I'm bad at labyrinth games), so I didn't finish it, but I had fun trying.
I didn't understand how sanity level works (I died a couple of times, and after that I just stayed in "yellow" location, switching to "green" only to check additional paths, and in yellow location the sanity level wasn't dropping, but I guess it's not the way it really works; probably I missed some description).
Overall, really nice game!