I think I saw that the game is unfinished bc I got an error while doing the math puzzle. Anyway the game is AWESOME!
Gameplay: Awesome idea, really creppy environment and sound effects, I love the puzzles and the mystery behind the gameplay, if you finish it someday let me know bc I want to be the first one to try.
Art: Completely awesome, this art really fits the depth and the environment of the game, keep it up.
Sound; Completely insane! Very good choice on that, just make sure to keep working with this kind of sound effects, it will be awesome!
Overall: You game is a solid 5/5 if you finish with a good plot, remember to keep up with the mystery, horror and drama in the text based choices, try not to run away from the initial idea, it has really great potentials, great job!