Game did not start by default. I then added extra LAUNCH OPTIONS for the game to force Direct3D: PROTON_USE_WINED3D11=1 %command%

With this extra parameters game runs normally but I notice that graphics are not as clear as in windows (antialiasing). After some googling I think graphics would be perfect if game would run with Nvidia Vulkano driver. My version of nvidia driver 455* already has Vulkano support but too bad it does not work. I tried all other nvidia drivers from PPA repositories, official Nvidia. It doesnt work without forcing D3D.

This is my first game I tried on linux and hats off to developers for making it possible!