I developed a bash script which automates the deployment of Ultrawide fix to combat black bars on the steam deck.
You can find it here.

If you are not familir with Linux there is a step-by-step Steam Guide. Fix requires an older 8.05 proton.

Overall, even without full screen, game is a perfect out of the box experience for SD.
Perfomance is great, game is designed to play with the standart gamepad layout.
Font is on a smaller side, but I personally have not experienced issues reading it.