I've finished the game, great little puzzle/horror game. It really tests your attention to detail. Hope to see more like it in the future.
I have a couple of suggestions:
Have a faint background clicking that runs in time with the Newtons Cradle and time it with the balls hitting each other, I think this could add to the atmosphere and sense of urgency.
The the Unknown character appears at the door, and asks if you have seen his Niece, the response on screen is "No, I haven't seen it.", the correct response should be "No, I haven't seen her"
apart from that, the rest of the game was wonderful. The lighting effects from the tree were outstanding and really added to the atmosphere