Luma Island devs spent an 'enormous amount of effort' to make it smooth on Steam Deck
Luma Island looks pretty sweet from Feel Free Games, a game that combines together elements of adventuring and building together that you can play solo or with up to 4 people together.
Discord Server
Alternatives to popular games that don't work on Linux, Steam Deck and SteamOS
Why some games on Linux, SteamOS / Steam Deck have broken videos and what you can do