Thunderstone: I heard about this on Unfiction. Seems like a good game, has anyoen here tried it out yet?
I played for about 30-40 minutes. I give the team at Parsec Productions credit for the hard work they put into this. I is definitely in the same vein as Penumbra or Amnesia though not as well polished. Gamplay consists of collecting "clues" which are scraps of paper found on walls or trees while trying not to run into Slend.
It's free and it's legit so you have nothing to lose by trying it out for yourself. Just don't make the same mistake I did and run over to the tall guy behind the tree to ask if he has seen any clues laying around.