Avoid if you want to play The Fruit
After exiting a game and re-entering the hub, the mouse would no longer remain bound to the window until I alt-tabbed twice.
The Fruit apparently crashed my graphics driver, requiring a full reboot. The same happened with Proton Experimental. This does not seem to be a Proton-specific issue, judging by the Steam discussion posts about it. There are no known causes or workarounds, it's just going to be luck of the draw whether the game works for you or not.
Proton 8.0-5
Game appears to work now out of the box including the videos
With current Proton the videos in "Axis Mundi" are working, and I was not able to replicate the crash in "The Fruit". Though there are reports from Windows users that "The Fruit" is unstable, so the problems I reported previously can have been unrelated to Proton and it just a matter of luck.
As for "Rose of Meat", there is a previous report of content missing, but I have been unable to see/confirm this so that may have been resolved too.
WINE_DO_NOT_CREATE_DXGI_DEVICE_MANAGER=1 %command%
One of the games "The Fruit" always crashes the display driver at a specific spot (hard reset needed). "Axis Mundi" requires the launch option or the intro video is glitched.
Mostly ok, but only 5/7 games work flawlessly. 2/7 are unplayable.
"The Fruit" crashes the AMD driver. Seems ok on Windows though.
"Rose of Meat" is missing significant content and is unplayable.