Tactical Troops: Anthracite Shift: https://www.gog.com/wishlist/games/tactical_troops_anthracite_shift
Game has release date today, at this moment it will be only on Steam, but I've asked developer on their discord channel - they're considering other platforms, GOG including. So let's make it happen!
(game itself is tactical turn-based game, sci-fi theme, single player campaign + hot-seat and online multiplayer)
official website + screenshots: https://tacticaltroops.net