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I’m not sure if I understand your intentions.
Proton is typically used through steam, but steam isn’t going to fly?
Is it being a proton enabled game matter?
L4D2 is still popular, esp on Linux but needs steam.
Beyond All Reason is a foss RTS, similar to StarCraft.
Cataclysm CDDA is a fantastic foss survival RPG. (Single Player)
Finally I feel motivated.