Torque is a physics-based first-person puzzle/platformer, relatively close to Portal in its artistic design, but using a rotation-based main mechanic instead of portals.
The game is still in development and has already been Greenlit on Steam. It should be available on PC and Linux around early 2016, but the alphaversion PC demo is already available on IndieDB, Itch.io and GameJolt.
portal physics-game puzzle-game first-person platform-game