Steam is offering downloads of The Red Solstice for PC for FREE (regularly $19.99) for a limited time. Deal ends February 11, 2018.

The Red Solstice is a tactical, squad-based survival game set in the distant future on Mars, playable in single-player or with up to 8 players in cooperative online multiplayer.
Roam freely over huge maps, complete randomized objectives and deal with surprise events that keep you on the edge of your seat.