Inscryption 10/10 (6/10 on Steam Deck)
Haven't quite finished it, but I already know this'll be a 10 unless something unexpected happens. Card/deckbuilding game made by the Pony Island guy and maybe because I only played it on the deck, I kinda... forgot about that? So when the game inevitably had its "Pony Island moment" I was floored.
The card game is fairly simple but has enough nuance to be interesting, and it expands quite a lot after the Pony Island moment. Interesting game concept that apparently contained an ARG which has since been solved, so I'm sure there'll be interesting reading ahead of me once I finally finish it. They also added a free mini-expansion that turns the game into a bit of a roguelike, so that's even better value for cost.
-2 points on Steam Deck because you have to awkwardly use the pads/stick to emulate a mouse. It's functional but rather cumbersome. In many cases, a button you click on pops up when you're near something, and it seems strange that you can't just press A to automatically interact with it. Hardly a deal-breaker but annoying. I haven't yet checked for save cross-compatibility. I'm sure it's fully compatible but it'll be another -2 points if Linux and Windows saves aren't compatible (big issue with Blasphemous on the deck.)
E: It does not, in fact, have cross-compatibility with saves. Windows and Linux have separate saves. Steam Deck score updated to 6/10. Still a great game but it has a lot of warts you'll need to be willing to overlook.