The idea is cool, i haven't played exit 8 so it is my first experience with a game like this. I think my main problem is i don't really know what to look for to know when to turn back, the tutorial is very cryptic and you don't really have a phase where you know: ok now i must pay attention and remember THIS room.
The music is nice, i read the comment that some sounds aren't playing and that is probably part of the reason why it is so hard, a real shame that happened. The pixel art is good, and overall i enjoyed the aesthetic