Project Temporality, AKA Portal-With-Time-Travel, will be out on Steam on May 20. There's a new trailer above with some hot, single player co-op action to get you in the mood.
Stop me if any of this sounds familiar. Awakening from a cryo-tube, you make your way across an abandoned testing facility, following the commands of a character you cannot directly interact with, using a piece of ultramodern technology in increasingly creative ways to overcome obstacles. Yeah.