Proton ge 10-34 works great and plays well. Go to desktop mode, install protonUP-qt via the steamdecks app store (discover or if on bazzite bazaar) launch and install proton ge 10.34 via the drop down menus.
Add the game to steam in desktop mode, ( browse where the files downloaded. Right click it and click add to steam) go back to game mode>gear icon>properties> compatability. Click force the use of specific steamplay compatibility and select proton ge 10.34. enjoy