Valve put out a small update to Proton Experimental to begin the weekend, with fixes for the Epic Games Store and a few games for Linux, SteamOS and Steam Deck.
Squirreled Away is a cute casual craft-and-thrive adventure that you can play solo or with friends, and now it should work great out of the box on Steam Deck.
I'm not entirely sure if their announcement of it being the "world's first" truly holds up, but I can't say I've seen anything like Rhythm of Resistance.