I do want to warn for the case of Genshin about Mihoyo banning people as the only way to get it working is with that one Anime Game Launcher that bypasses the anti-cheat.
The game still runs in SteamOS that way, and while I do know people often say it’s not often it happens or rarely gets reported of happening, it is still a risk and I remember seeing somebody having a breakdown on r/steamdeck a few months ago because they lost a ton of progress in Star Rail after doing the same thing for it on the Steam Deck.
The safest option (what I do personally) is just using it on Windows.
It is one of the weirdest and most interesting anime series, I’d always recommend it. It is definitely a bit slow at times though, but it was really fun and I’d still say it’s worth watching. If you want something similar, but more action-filled (albeit slow and depressing as hell), Texhnolyze also exists.