These are some really nice riddles. It took a while to get the hang of it, but once that was done, it worked out really well. The game really had a creepy atmosphere, and i'm not going to say anything about the ending, but you just have to play it. It's going to be worth it.
Just can't get that secret ending though. I have been trying for a while now, and I wanted to get a new account after losing my last one, just to be able to ask about it... :S
Amazing game! :D