"Depressing" is in keeping with the game.
I love the style and the light to dark mechanic. If you can't see something it's not there, very philosophical in nature and creates for unique puzzles and way of thinking.
To all those saying the game is "too depressing" with the music.
I think it fits perfectly. I mean the games called Closure, with a sketchy black and white art style where a dude has to bring light to the dark. The gothica music is in keeping with the tone of the game. I could say it could be changed up a bit for variation in from level to level but the overall mood is fine Tyler.