
Simply Works with default settings
mangohud %command%
Crash after Update 1.02. It crash after 2 seconds of music and firefily logo. Befor 1.02 runs perfect. After looking into many logfiles, found that a dll is crash. the solotion is install MicrosoftEdgeWebview2Setup.exe form M$ over protontricks. :-( After installation of webview2 starts without errors ;-)

I just tried multiplayer and was really surprised—everything worked perfectly, and I was able to join and play without any issues.

gamemoderun %command%
Had significant performance issues with the game, it was eating up all of my notebook's memory. After reverting to Proton 8 and adding gamemoderun %command% it runs now fine.
Runs flawlessly on default Proton

Game runs perfectly out of the box.

The game's map editor doesn't show any maps that are downloaded either from external source or from steam workshop. The included file manager to find the map files from your system does not work with Linux.
The game otherwise seems to work out of the box, I could get into missions, start a skirmish match and play the free building mode. The UI seemed to work as it should. Didn't play enough to see if saving worked. I ended up refunding for at least until they fix the map editor for Linux

The system can be limited to under 8 Watts TDP.
play very well, didnt encoutner any issues so far

PROTON_SET_GAME_DRIVE=1 %command%
without the launch option, I was not able to start any mission.

Crashes in the 'Briefing' stage, after starting the campaign. This is because it tries to call Vuplex Webview which is incompatible with Proton. Can be circumvented by clicking through the briefing very fast.

PROTON_SET_GAME_DRIVE=1 %command%
Crackling only at the beginning of a mission briefing. Audio in-game later runs fine.
Latency with selecting multiple units though this mostly likely is an issue with the demo itself since windows users report this issue as well.
Mission briefings seems unstable at first and caused crashes without added launch option and specific proton version. As soon as a mission starts it seems to run fine.

Game crashes in Campaign selection
You have to click VERY FAST through the campaign into - the game only crashes in the campaign intro screen. I had to make a Auto-Clicker to make it work, sadly no jet-pilot reflexes.

gamemoderun %command%
With latest proton vanilla / ge / hotfix couldnt get further then the menus, When launching with older proton version (0.8.5) it worked flawless