Nice concept! Very nice shaders and art work. The game was kinda confusing at first, wasn't really sure what I was doing or the controls the first 2 times, and the fact you have to completely restart the program to try again was kinda annoying.
Gameplay-wise, I think it would have made more sense to be able to see a room after you've cleared it of sound, because in some cases, such as the outside area, if you stop all the sound you have to just press directions and hope you don't get stuck and find your way back to where you're supposed to be.
Overall though it was a neat game with some nice polish, good job!