Hey nice game!
I especially like the adaptive music (jukebox on/off and lights on/off), we always try to add some adaptiveness to our music so it's nice to see other devs do it!
Really liked the atmosphere and puzzles.
One thing I didn't like was the time to respawn and having to walk all the way to the door again, I would have prefered to respawn in the level.
But anyway, great entry, good job!