

Text appeared fuzzy at times; if the aspect ratio is not srt to fullscreen you may loose icons off the side.
Had to change to fullscreen from windowed. fixes aspect ratio.
more like the tutorial locked me out and i needed to reboot.
Very low framerate which also degrades over time
Same issues with Proton. XWayland and Xorg perform the same.
-windowed
Game window not to scale with actual window
I couldn't get it to run after a few tries. Had to restart Steam and the PC a couple of times before it ran on its own.
Black screen after launch, not responsive
Couldn't get it to run
Had to use -windowed launch option for the game to start. It was playable but a bit laggy but it can be because of my low-end device.

The game launched in a window that I could not move. I had to maximize it and then go into its options to switch it to Borderless Window mode. Everything has been fine since.
The initial window seemed to think it was fullscreen and didn't let me move it around; I had to right click the game in the taskbar and maximize it there
Works perfect out of the box.
Awesome, I did the campaign entirely, it's like native (75 FPS constant, max of my screen, with highest graphical settings, 2560*1080).
As long as you select Windowed, you should not have any problems. Tried various Proton versions as well as Proton-5.9-GE-5-ST.
Same note as before, only Windowed worked.
See previous note, horrible mouse lag that would pause all graphics while mouse was moving.
Unless I selected Windowed 2560x1440x60, I had significant mouse lag that would stop all graphics while the mouse was moving. Tried Borderless, Fullscreen and Maximized window. None worked, only Windowed.

The game runs flawlessly.
Tested in demo version.