Enclosed and eerie atmosphere with a great dynamic of puzzle solving and one of the most unique aspects - microphone detection.
Rarely do I come up with games like this. It had great visuals, superb creepy atmosphere and the dread of not knowing what is going to happen next. Some parts of the game do drag a little, although it has a good balance of looking for the clues and maintaining silence, as the player does not want to be caught by anything.
Overall, good game. Best of luck with the future developments. Cheers!