This game is creepy. You wake up trapped in an abandonned hospital and all you have to do is to escape. It's not that easy, though. You have to beat many nasty puzzles in various enviroments. However, since this is not an action game but a puzzle-adventure, you can't die and time isn't limited. If you are really observant, you might find several mindblowing easter eggs.
By the way, if you feel like cheating a bit, there's an awesome walkthrough by almighty_aluqah in the discussion (post #190):