I'll have to look into that. I don't have a machine with a Radeon card though, so can I message you about this later? Thank you for letting me know!
I wish I could help. My 2 machines have an integrated Intel and an Nvidia GPU respectively and it works on both. Could be the vendor's OpenGL driver is picky. You could try a software rendering with a mesa driver: https://fdossena.com/?p=mesa/index.frag
Just put the opengl32.dll into the game's folder and run it.