Produces a crash dump:
error.log and output_log.txt

steaminfo

Arch linux
kernel: linux-next-git 4.18.0
CPU: Intel Core i7-7700HQ
GPU: Intel Integrated Graphics
Proton: Steam built in

Interesting snippet from output_log.txt

Initialize engine version: 5.2.3f1 (f3d16a1fa2dd)
GfxDevice: creating device client; threaded=1
info:  Game: MindOverMushroom.exe
info:  DXVK: v0.64-58-g6a5ad8b
warn:  OpenVR: Failed to initialize OpenVR
info:  Required Vulkan extension VK_KHR_get_physical_device_properties2 not supported
info:  Required Vulkan extension VK_KHR_surface not supported
info:  Required Vulkan extension VK_KHR_win32_surface not supported
err:   DxvkInstance: Failed to create instance
info:  Game: MindOverMushroom.exe
info:  DXVK: v0.64-58-g6a5ad8b
warn:  OpenVR: Failed to initialize OpenVR
info:  Required Vulkan extension VK_KHR_get_physical_device_properties2 not supported
info:  Required Vulkan extension VK_KHR_surface not supported
info:  Required Vulkan extension VK_KHR_win32_surface not supported
err:   DxvkInstance: Failed to create instance
err:   D3D11CreateDevice: Failed to create a DXGI factory
d3d11: failed to create D3D11 device (0x80004005)
GfxDevice: creating device client; threaded=1
info:  Game: MindOverMushroom.exe
info:  DXVK: v0.64-58-g6a5ad8b
warn:  OpenVR: Failed to initialize OpenVR
info:  Required Vulkan extension VK_KHR_get_physical_device_properties2 not supported
info:  Required Vulkan extension VK_KHR_surface not supported
info:  Required Vulkan extension VK_KHR_win32_surface not supported
err:   DxvkInstance: Failed to create instance
Crash!!!