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?

I haven’t had any problems like that, but I generally don’t leave my screen on. So perhaps I would have this issue, but just never notice it because of how I use the device.

I’m very conscious of energy use, I almost always manually set my laptop to sleep if I’m leaving it idle for a while.

Bazzite just works, it runs every game I have with zero fuss, it’s easy to run Windows programs / emulators / local LLMs, AND it’s basically unbreakable.