Has anyone checked out Benjamin Rivers' Home (http://homehorror.com/)? It came up on Steam as a suggested title, and at $2.99, it is moving towards a easy purchase. The website describes it as follows:
Awakened by an oncoming storm, you open your eyes to discover yourself in a strange, dark room—tucked away in a house that’s not yours.
As you play the game, it changes—subtly, almost imperceptibly—to reflect your perspective. It's a horror game unlike any other, and as you'll discover, its truths are entirely subjective.
I'm intrigued by the idea of an adaptive environment, especially if it was Done Right.