Works out of the box
Enabled FSR on quality and limited to 30 FPS (or balanced for 40 FPS)
The demo crashes upon launch, both with Proton Experimental and Proton 9.0-2

Rebooted steam deck and issue was gone

In game frame rate set to 30 fps, graphic quality set to Medium.
Performance and battery life are great. Easily getting several hours of playtime per charge.

Dropped FPS down to 45
Game worked fine right out of the box. Set FPS limit to 45 and it stayed consistent with a few drops to the 30's here and there. Also set graphics to medium and FSR set to quality. Frame generation didn't seem to make any difference when on.

Lowered graphics slightly, helped for longer battery duration. However, this introduced minor visual artefacts.

Works out of the box.
Installed, launched, and played perfectly. Ran at a steady high framerate. No need to force a specific version of proton.

Runs flawlessly OOTB.
Enabled the framegen option (quality) and it's perfectly smooth maxed out.

Great game, works great ootb
On game startup it shuffles through my audio interfaces for some reason but it works

Not unless you have hardware way better to the point where you don't care for upscaling/framegen
gamemoderun %command%
Cloud saves from windows didn't sync at all
Significantly worse performance than Windows
FSR and Framegen are apparently not working as intended (hence the degraded performance and ugly ghosting)
Hoping the devs fix FSR

First launch works after DirectX install. Opening the game again shows a black screen, you can't get to the menu or interact with the game.
If you can play the demo in one go you're fine, but if you save and go to play again you won't be able to.
Direct x needed to install but I just went through with it and it loaded fine, second launch nothing showed up
Demo run perfectly

The demo worked great on my desktop, except for the Visual C++ Runtime that was missing.
On the first startup, I got an error about Visual C++ Runtime being missing. Installing them with the dialog (there is a Yes option that will install them) worked.
slight screen flickering on highest settings