Appears to work fine except no DS4 support.
Hello @daasuharo, please copy your system information from steam (Steam -> Help -> System Information) and put it in a gist, then include a link to the gist in this issue report.
Steam
Help
System Information
https://gist.github.com/daasuharo/236148034fd15bd354eda262212ea607 Proton 3.7-5
proton 3.7-5
Appears to work fine except no DS4 support.