Hello @Damglador, please copy the contents of Steam Runtime Diagnostics from Steam (Steam -> Help -> Steam Runtime Diagnostics) and put it in a gist, then include a link to the gist in this issue report.
DXVK failing to initialize usually hints that there isn't a usable Vulkan render path. I'd check if the vulkan-intel and lib32-vulkan-intel system packages are installed and add them if they're missing.
Yup, installed lib32-vulkan-intel and looks like it works fine. Also adding PROTON_USE_WINED3D=1 %command% makes it work. That also fixed other oldish games with the same issue
Compatibility Report
System Information
I confirm:
Symptoms
Game can't launch at all
Reproduction
Try to launch the game through Steam using Proton
Additional Notes
I was able to launch and successfully play the game using Bottles gaming preset with disabled DXVK and VK3D with soda-9.0-1
Proton log:
steam-394970.log