Even tho I'm not a fan of pixel art in general, graphics look really nice, atmosphere is good, supported by the music
The puzzle is hard and takes some time if you do it on your own, but I feel like it's mostly due to the fact that all of the puzzles are mixed together, and that you can't get any "validation" when you think you finally understand one of the sub puzzles
I think it can depend on people tho, and I know that some people who love it
Final room location should maybe be more explicited, and the end of the game was rather sudden