The latest unique game from Phr00t's Software, the RTS 'Adapt or Perish' is releasing on Monday 11th February with Linux support.
Unlike most traditional RTS games, Adapt or Perish doesn't have a traditional build list of set units. Instead, you tweak basically everything and create your own. You can adjust their damage, fire rate, range, damage type, special abilities and a whole lot more. It's one of the most customizable RTS games I've ever played.
For a longer look at it, the developer recently put up a new video as an introduction to it:
As I've had access to it for a while, I shall have some thoughts available at release.
You can follow it on Steam.