Apparently it's playable once you get into the game. That's if you're willing to blindly fumble through menus. I am not and I imagine most are not.
ISTR having some hallucinogenic colour issues when Vulkan wasn't properly installed.
I installed the packages vulkan-radeon and lib32-vulkan-radeon just in case. Now I'm just getting a black screen with this game. I'll keep testing.
Update: I removed those packages as they made everything worse and even broke several other games.
Tried without mangohud, gamemode and/or gamescope? Also try turning off steam overlay, that should be the primary difference between steam and gog games, bar drm.
Try forcing Proton Experimental, see if that makes a difference.
I tried that along with GE Proton to no avail sadly.
Math probably.
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