Strategy games are often about destroy or be destroyed, but what happens after that? Do you want to win only to control ash and rubble? Epicinium is a multiplayer strategy game where you need to be careful with your battles.
Stardew Valley, the lovely farm-life sim from ConcernedApe and Chucklefish recently gained the long-awaited multiplayer support. The Linux version was previously left-out on GOG, but they just added it.