Enjoyed the game a lot. Cool idea and very polished.
Agree that not seeing what levers did made it hard. Lack of sound for things far away made me question if they did anything. I thing a good compromise between showing exactly what they did would to play the sound so you had an idea of what type of thing they changed. I also had trouble noticing the door changes from red to green and I am not even color blind.
Overall it was a lof of fun. My favorite thing was the menu which looks fantastic.