If you could use some of the Tuxcart resources/engine, perhaps a vehicle-based battle game with a garage for customization of your vehicle?

I’d say keep it simple to start. Perhaps a turn-based tactics game like final fantasy tactics advance, or more 3D, like XCOM?

No worries, bazzite has you covered there too.

https://flathub.org/apps/com.heroicgameslauncher.hgl

I can second bazzite. It. Just. Works. But it is built differently from the distros that everyone has heard of like arch & Ubuntu, so it’s best to read up on how to install non-flatpak programs.

Keep in mind that steam can run Windows programs for you with it’s emulation layer. It’s not the only option, but it is convenient as an app launcher.