Hello @SirRolls, Proton uses DXVK and VKD3D to translate Direct3D 9/10/11/12 to Vulkan. This requires a spec-compliant Vulkan driver and mesa/nouveau does not provide any driver support for Vulkan, which makes your current system configuration unsupported. Please use the nVidia proprietary driver with Proton.
That said, your log does not indicate a graphics failure, instead, err:module:map_image Could not map section .reloc, file probably truncated and wine: Unimplemented function shell32.dll.SHGetFolderPathW called at address 000000007B00FC3E (thread 002c), starting debugger... looks like a couple lines of interest from your log. This might hint that Proton 5.0-10 is damaged somehow.
I could not reproduce it, just starts here with current stable Proton 6.3-5 and Experimental.
Compatibility Report
Amazing Cultivation Simulator (955900)
System Information
GPU: GTX 1080
Driver/LLVM version: nouveau
Kernel version: 5.10.52
Link to full system information report as Gist:
sysreport.txt
Proton version:
5.x to 6.x
I confirm:
steam-955900.log
Symptoms
Game fails to boot
Reproduction
Attempt to launch the game