Thanks for the feedback! The music sync is actually just a hack and isn't very reliable when there is latency - it depends on the audio loading at roughly the same time as the shader. I originally wanted to use spectrum-anlyzer to try to time the music with shader effects, but it wasn't easy. I got the FFT output into a texture, but I got stuck trying to figure out the beats from it, nor could I derive anything that was visually interesting from it, so I gave up lol.
I've renamed the toml files (didn't know what was a thing!), but unfortunately I can't figure out how to cross compile bevy to linux. I think I might just add a proper build pipeline next time.