FINAL FANTASY TACTICS - The Ivalice Chronicles released on September 30th and while it's Steam Deck Verified, it had some troubles on Desktop Linux.
Valve just released an update to Proton Hotfix which should sort out the most pressing issues with playing it on Desktop Linux including the game not launching properly, and some very annoying background flickering as noted on the GitHub bug report. All you need to do is change over your Proton version for it to Proton Hotfix. Check out the GamingOnLinux guide if you don't know how to do that.
A remaster of the 1997 classic, FINAL FANTASY TACTICS - The Ivalice Chronicles transports players to the war-torn Kingdom of Ivalice, a medieval realm fractured by political infighting, class struggle and the ambitions of rival noble houses in the wake of the Fifty Years' War. Against this backdrop appear Ramza, third son of House Beoulve, one of Ivalice's leading military families, and his childhood companion Delita, a commoner raised amongst nobles, who find themselves on opposing sides of a war brewing within the kingdom.

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Highlights:
Key features include:
- Tactical Battles that Define the Genre - Engage in strategic, turn-based combat across diverse and dynamic terrains where every decision matters. Terrain advantages, unit positioning, and character customization come together to deliver thrilling battles full of unexpected twists. This acclaimed battle system is what makes FINAL FANTASY TACTICS – The Ivalice Chronicles a quintessential tactical RPG experience.
- Robust Job System – Utilize over 20 jobs and 300 abilities, from black mage to dragoon to time mage—each job features a distinct skill kit, which can be further customized by assigning abilities learned from other jobs, providing nearly endless builds and strategies unique to each player’s playstyle.
- Enhanced & Classic Versions – The enhanced version of the game includes a breadth of new features such as updated visuals, an overhauled UI, added dialogue and full voice acting alongside quality-of-life enhancements like fast-forward and autosave. The classic version lets players relive the faithful 1997 classic with the renowned War of the Lions translation—discover what made the original a timeless masterpiece.
Since release it has managed to get a Very Positive rating on Steam which is great to see.