Great game - the clues to the puzzles felt tough but fair, I only wish there were more of them! The music added a lot to the mood of the game, although I did find myself turning up the volume to hear the narration, then back down again when the music picked up.
I did want to point out a couple of places where I broke things and had to restart the game:
1) At one point I closed the sliding gate (the one in the corner where you start out) on myself out of frustration and ended up stuck, unable to see anything and unable to find or interact with the switch to open the gate back up.
2) In the corner across from where you start (the one with the puzzle on one side and the gate on the other), I pressed the button to open the stairs and walked out while the stairs were coming out, without opening the gate on the other side or switching on all the wires in that corner - so after the stairs opened I couldn't get back in to open the gate and finish things in there. Maybe make it so you can fall off the top of the stairs just in case.
Overall, it was a short but sweet experience! Keep making puzzles!