Outlast is definitely one of the best horror games ever!
The story is actually not bad but in the end it gets a little bit messy, but, if you understand it, it's awesome.
The gameplay is absolutely superb and fresh, it introduces some cool features, the fact that you can only see in the dark with your camera is really creepy, monsters are creepy too and the atmosphere is fantastic, the asylum is a great place to play a horror game.
One of the best times you're going to have with this game is escaping monsters and hidding from them, you'll feel your heart beating so fast... it's a big thrill.
So if you like this game as much as i did you'll only turn off your pc when you finish the game, but you're gonna have to wear diapers if you're a really afraid person.
The only bad thing in this game is that it was a bit short but i pass that because the rest of the game is just freaking amazing.
You should definitely buy this game as soon as you can.
Peace out