Ao Oni is pretty creepy. You should try it, if you want to play it.
Pretty creepy is not a great way of describing something isn't it? mind elaborating a little bit? (elaborating is the right word to use in this sentence right?)
Have you guys heard of The Haunt: The Real SlenderMan Game? The graphics are awesome for a free game. The mechanics is the same though, collect pages and all that, but Slenderman has gotten a bit scarier if not more nicely rendered. Slenderman here moves...not just teleports.
Anyway, other than the usual slenderman game, Amnesia remains a scary game for me. Those long mouthed creepy humanoids can give you nightmares beyond belief sometimes
Because I am sort of a "slenderman" fan, I cannot imagine they made a game where Slenderman actually walkes... because he can move only when he isn't being watched. For example: he cannot move if you watch at him, but when you blink, he could move over a short distance, like taking a small step or something, in the split-second you had your eyes closed, this makes it look like teleporting.
About Amnesia, (little spoiler maybe, nothing that spoils storyline) yeah, it's pretty scary. I remember myself hiding behind a couple of wooden barrels, the room was completely dark and I just ran away from the horrible malformed beast/guy that had been chasing me. I closed the wooden door behind me, ran towards barrels and crouched in between them and a dark corner. Just when I was about to stand up and lit a candle already (to gain sanity). He started breaking down the door and I ran towards the corner again, but it was to late and trapped in the corner between the barrels and him. He started smashing the barrels and I picked on up and threw it at him. For a split-second he was stunned and I made my way towards the gap where once was the wooden door. I wasn't fast enough and he slashed me once, I was badly injured but managed to run to some sort of whine cellar, where I finally successfully hid from him. I needed to sit next to a candle for like 10 minutes before my sanity was normal again :D
Awesome game.