Totally Accurate Battlegrounds got upgraded recently due to needing to implement new anti-cheat, and thanks to that this free to play game now works on Linux Desktop and Steam Deck.
While no announcement from the developer has been made yet, Hunt: Showdown now has the Easy Anti-Cheat file needed and works on Steam Deck and Linux Desktop.
Continuing the improvements from the previous release that added Linux support, the Modern "Jedi Engine" replacement supporting Dark Forces, mods and in the future Outlaws - The Force Engine has a new release out with lots of upgrades.
KDE Plasma 5.27 sounds like a really great update to this desktop environment, the same one used on the desktop mode for the Steam Deck and my personal choice for my PC too.
Alina of the Arena looks like a lot of fun if you love your deck-builders, and a recent update should make it a lot better on Steam Deck (and Desktops with a controller).
Released back in 2018, the one-button arcade game Ding Dong XL from Adamvision Studios that has an Overwhelmingly Positive Steam user rating gets upgraded ready for Steam Deck.