I don't quite understand how some people were THAT freaked out by Amnesia, but I will say it is hands down one of the scariest games I've played. I don't think any level of scariness in a game could make me unable to push on though, the nervous sneaking is the best part. The thrill is the very reason I want to keep going.
@Niki, don't let the no gun thing throw you off, it's in first person but the idea is not to go into it with a shooter mindset, it's meant to be a game of exploration and mystery and chairs that scare the shit out of you. That's part of why it's scary, you are forced to be careful and at least somewhat thoughtful, and when you are sneaking about it just pulls you further into the game.
I love it when I'm in any game where I'm running my ass of for the door and I KNOW there is something right on my ass but I don't even have time to look. The feeling of something closing in on you makes it almost suffocating the closer you get to the door.
It was a common occurrence in the STALKER games when your gun broke or jammed, or maybe you just ran out of ammo (part of it's survival horror aspect is the lack of resources) and a glowing pair of eyes comes flying around the corner and all you can do is run like a motherfucker.