Don't Starve is an "uncompromising wilderness survival game". In it, players walk around a large (and randomly generated world), picking up moustaches, wood, bunnies, rocks, and other materials in order to get the supplies together they need to comfortably survive in the Wilderness. It's quite a bit of fun, and still in development! There is a bunch of stuff to do, and supernatural elements are a theme as well, with walking pigs and mysterious artifacts to play with. And hell hounds. There is a demo that allows you to play a few days before you purchase the game, too!