Game worked perfectly out of the box, no tinkering, no custom proton just install and run. I experienced minor frame drops around 25-27 FPS on default settings, but that is somewhat expected on big map with a lot of details. IMPORTANT: contoller scheme is binded to mouse and keyboard shortcuts, but it is playable, if somewhat clunky. The developer promised that on 1.0 release there will be full controller support.