There's an unofficial confirmation that Goblin and Coins works out of the box on SteamDeck. Here's a picture proof:
We're all waiting for Valve to test and sort all the 60.000+ games on Steam for SteamDeck compatibility. With that amount of material to go through, it's understandable that Goblin and Coins, being a very small indie game, won't be a priority for a while, and that's okay (there's ~1300 games rated so far).
But while we wait for the official rating, there's many 3rd parties that have access to SteamDeck and with the lifting of embargos and the official release of the handheld, it's now possible to simply have the game tested - not as throuough as Valve's doing it and certainly not with an official verified/playable rating yet - but enough to know there's a 2D platformer you can run on your brand new handheld when that bean soup starts playing it's tune.
Source for the pic and the test: LiamD from GamingOnLinux.com . It's an amazing website for all gaming news and reviews related to gaming on GNU/Linux, check it out.