Polarity, a first-person puzzle game previously planned as an Ouya exclusive, is aiming to release on PC now as well. It was put up on the Ouya store back in March, but a demo is now seeking Steam Greenlight support.
The Greenlight page (via RPS) cites Mac and Linux support. The core puzzle mechanics revolves around hacking into data centers to steal fragments, and it cites Portal as a major inspiration. It will also support Oculus Rift.