Fun spooky game. I like the hiding under the bed to get away from him initially, though I think he maybe takes a little long to leave. The ringing noise is also a little sharp, it could use some reduction on the high frequencies.
I really liked the lockbox puzzle.
EDIT: I wanted to go more into detail about what I enjoyed about the lockbox puzzle: it is a really good balance of esoteric and sensible. There is a good natural hint in the interface of the lockbox that immediately had me looking for non-standard ways of finding a combination. I was watching a friend who doesn't much play video games play it at first- and she actually figured it out before I did; I think that's a good sign that it's well-crafted and not leaning too much on established design tropes.