Well, almost (49/51%).
Needless to say, the steam deck has definitely found its place playing Monster Hunter, Graveyard Keeper, and sometimes even Guild Wars 2 and factorio.
It does run Deep Rock Galactic and Vermintide 2 too, but I feel those are better played on the rig.
Actually yes. PokeMMO. I wonder whether Steam tracks this because PokeMMO is not available on Steam though.
Alternatively we got Temtem on Steam from which i heard that it‘s a good game.