After Brotato addiction I found this gem of a game, right before the sequel announcement it seems. It’s such a perfect game for the Deck at least for me - you have time to think, the controls just work and you can just put the game down and continue your run later.
Do yourself a favor and try it out even though your first runs will probably be a disaster. The core game mechanic is so tight and well done it’s a pleasure to play loop after loop. 50 hours later I still want to do ‘one more run’.
The interface is just so responsive and well laid out in Slay the Spire which makes it a joy to play. Not just on the Steam Deck.
People mock the graphics sometimes but I’d much rather have something this responsive than bombastic but sluggish (Hearthstone comes to mind - haven’t played in years thou maybe it’s better today).