With Proton versions >=7.0 (specifically tested 7.0-3 and Experimental, as well as GE-7.17 and GE-7.28) it dies after a few seconds (play button turns to "stop" for a few seconds then turns back to "play"). With Proton versions <7.0 (specifically tested 6.3-8 and 5.13-6) it just hangs (play button stays as "stop" indefinitely but no window is created). Not sure how everyone here is getting it to work flawlessly but it's definitely not been my experience.