Super Meat Boy just might be the only platformer I've ever played that I can say surpasses Super Mario World. Some of the levels are ridiculously insane.
Also, I played Amnesia: The Dark Descent at a friend's house.
Holy sh-
-so yeah, this a game I will never, ever be seen playing again. I only played it for 15 minutes and I wanted nothing more than to fling the computer out the window. It came out in August, but it is very much an old school survival horror. You literally have NO WEAPONS. If you encounter a monster, the only thing you can do is run and hide and hope it doesn't find you.