itch.io

You could possibly try using the file provided here: https://github.com/Shirakumo/cl-soloud/blob/master/static/lin64-libsoloud.so

And place it in the same directory as the executable (renamed to libsoloud.so). I’m not very experienced with Linux, so I apologize that I’m not very good at troubleshooting these sorts of problems.

I also tried playing on Linux a couple of days ago, and the solution for me was to run the game with vanilla Wine. Running through Proton just crashed the game immediately, but Wine works perfectly fine for whatever reason. I played for several hours and haven't encountered any issue with it.