Factorio in particular actually ships a native Linux version. Someone at Wube actually tries it AFAICT. So that should be something you could try day one, probably. Besides some weird situation, I’d expect every other game to be harder to run than Factorio.
I’m going to give you the benefit of the doubt and assume what you said was simply confusing, but not wrong.
So just to be clear if your raid array fails, and you’re using software raid, you can plug all of the disks into a new machine and use it there. But you can’t just take a single disk out of a raid 5 array, for example, and plug it in and use it as a normal USB hard drive that just had some of the files on it, or something. Even if you built the array using soft-raid.