This report may be useful for people that installed the game in a different partition than the one the linux steam client is running on.

Initially neither the game nor config tool would open.

Would just show as running in steam a couple seconds and then exit, without showing anything on screen.

Running the steam client in a terminal

$ steam

Showed errors about permissions on some files in the drive the game is installed at. The game's library is in a different, NTFS partition (it's pointing to the window's steam client library) than the linux/steam proton partition, and there were permission issues showing up in the stdout log of steam despite the drive being writeable.

Files in that NTFS disk (for example, with ls -l) were shown to be root:root owned, the fix is to change an option in the ntfs-3g driver to make the files appear as owned by the current user. Use -o uid=xxxx,gid=xxxx (or user_id,group_id, I changed both in the end since that's what I had in my fstab despite the documented option being the uid/gid ones) in /etc/fstab or in mount -o uid=xxxx,gid=xxxx , where xxxx you get from your /etc/passwd for your user, look it up if you need more details.

To verify you did it correctly, when listing files (ls -l) in your NTFS partition you should see that the owner/group is your user.

After fixing this the game looks great, with antialiasing, good sound and without a glitch I had with the controller (Xbox 360) when running the game with regular wine + xboxdrv.