Mechwarrior 5 mercenaries with mods that add lots of lore-accurate content and additional equipment/loadout options.
I'm just starting to get some of the bigger mechs, and the carnage is epic and loads of fun. The short missions are also great for me as a busy father.
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.