I would HIGHLY recommend Amnesia: TDD. It's the game that rebooted survival horror games when they were deemed 'unpopular'. True, the Penumbra games came before but this is the game that kicked off YouTube celebrities and is still played and modded today!
The main campaign is an unnerving experience, if you haven't seen gameplay of it. If you have then I suggest giving Custom Stories a go.
Penumbra is not working for me and you would probably have to reinstall your driver for it to work so I would say give Amnesia a try, you WON'T regret it.