To claim the freebie:

Click here and click "Get it FREE" in the SYMMETRY banner on the GOG homepage. (You may have to scroll the page to find it.)

About the game:

SYMMETRY is a survival management game set in a retro- futuristic, sci-fi universe. Your main goal is to manage the crash survivors and help them withstand the desolate, extremely cold environment in order to fix their spacecraft and escape. The non- obvious plot is accompanied by an atmospheric musical score and graphic design that sustains the harsh and mysterious ambience.

For reviews, system requirements, etc:

Refer to the game's pages on GOG or Steam.