itch.io

It's probably Unity's HLSL->GLSL transpiler at it again... That tool is, well, let's not talk about it, otherwise I won't stop ranting.

I've found that the game is running fine if using Vulkan instead of OpenGL.
So, try launching it with the "-force-vulkan" command line parameter.

Maybe the binary does not have the execute file permission? (Check file properties in the file manager.)

The Linux build only has a 32bit binary.  It might improve compatibility with modern Linux distributions to offer a 64bit binary instead (or in addition).