Here's something a little different for you: All Quiet in the Trenches recently hit Early Access on Steam, blending together a narrative turn-based strategy RPG with a first world war setting. It has Native Linux support but no Steam Deck rating just yet.
More about it: "In the game, you're playing as a German Unteroffizier - a sergeant - on the Western Front of World War One. You're responsible for a handful of soldiers and have to make meaningful decisions. You lead them in battle trying to strike a precarious balance between the ambitions of your superiors and the survival of your men. Your actions will not change the war. They will however change the lives of your soldiers. You cannot win, but maybe they can survive."
The developer, Totally Not Aliens, are based in Bamberg, Germany and say it's meant to be taken as an anti-war game. They plan to keep it in Early Access for 1-2 years as they expand it to cover up to the end of the war in November 1918 with it currently having from early 1915 to early 1916.
Check it out on the Steam page.