And using OpenGL results just in black screen (AMD Vega 56, latest Mesa master).
Vulkan error looks like this:
Looks like you forgot to build it with SPIR-V shaders.
Yes, the directory is there. As for the file:
du -b HeliumRain-LinuxNoEditor.pak 3548394868 HeliumRain-LinuxNoEditor.pak md5sum HeliumRain-LinuxNoEditor.pak 9a8279a59b35ffcc847779c130514099 HeliumRain-LinuxNoEditor.pak
May be something got corrupted, I can try re-downloading and reinstalling.
UPDATE: Downloaded again, retested - same error.