The game launched fine OOTB. However, as many here listed using the CoZ patch (http://sonome.dareno.me/projects/sghd.html) greatly enchances the experience. However, I had some difficulty with the install script and proton version that the game "supports" The installer script for Linux (https://github.com/CommitteeOfZero/polyversal-coz-linux-patcher) fails for me everytime which I believe is due to the protontricks flatpak used. I was able to run the main windows patcher executable by just installing wine from my repos and running it directly. Proton 8 would not load the patches but experimental works like a charm. Other than quirks installing CoZ the game, minus alt tabbing, works great.