The Super Hot Team are turning their puzzling Unity prototype FPS into a full game and are seeking community funding for doing so. You may recall their prototype for the 7 day FPS competition where time (and bullets) only moved when the player moved. Maybe not, though, since this is the first time the game will be available for Linux. Currently, the Super Hot funding project has surpassed the original ($100,000) goal.
You can pledge your support here to receive the game upon release in early 2015, or a little earlier depending on the size of your pledge.