I just saw this small horror game gem named "Hide". It is a extremely straightforward game with really simple graphics. Basically the game is all about locating five signs scattered across a map whilst avoiding becoming found. I believe it is a great example in how not displaying one thing correctly tends to make the imagination go wild. The really sparse (however workable) graphics and the atmospheric soundscape forces you to immerse your self and picture your worse fear.
The game only takes a handful of minutes to play, so I recommend you all give it a go. And do not neglect those headphones!