I can say offhand that No Man's Sky put a lot of extra time and effort into their Steam Deck support so that definitely works. Otherwise your best bet is to check either the Steam listing for a game (check the Deck Verified rating. Anything rated "playable" or "verified" should work pretty seemlesly on any Linux gamingPC) or https://www.protondb.com/ (a user run listing of the compatibility of different games. A good resource and often has some troubleshooting advice. Unfortunately it can often have outdated or just inaccurate information as it's all based on user reports. Still usually a pretty good indication of compatibility.) There's no indication on either regarding Starfield compatibility. Given that it's probably too resource intensive for the Deck it may not get as much special attention from Valve as something like Elden Ring (which ran better on Linux than any other platform after it was out for a few days and Valve had added a patch to Proton to fix an issue that the developers took longer to patch in the game itself.) Chances are pretty good it'll work though (assuming your hardware can run it.) The Steam page for Baldur's Gate 3 says it's Steam Deck Verified so it'll just work so long as you launch it through Steam. Here's the protondb page for reference https://www.protondb.com/app/1086940 . Crusader Kings III, Rimworld and Stellaris apparently all have native Linux ports so, while you may find reasons to prefer running the Windows versions with Proton, you don't actually need to check for any special compatibility. They just are Linux games.