I do have a screenshot of completing the game, but I realize it gives something away, so I'll ask you to take my word for it. :)
Very well done puzzles and lightbeam mechanics. I enjoyed how standing in front of a mirror would cut off the light, even if that sometimes meant waiting an extra second for a door to reopen.
The one problem I had is that several rooms are arranged in a way such that the final beam you need to position doesn't allow the player to see the spot they're aiming for. Sound queues help to know you've hit it, but that also happens if you overshoot, so it creates a situation of running back and forth between the mirror and a spot close enough to see if the door is going to stay open.
Also, when I restarted the game after completion, the player character was caught in the animation for moving a mirror, complete with stepping sounds.
I'd say the number of puzzles and their difficulty is just about perfect for a game jam length submission.