There's also some unofficial builds on GitHub that have lower GLibC requirement. And it's better to install vlc altogether otherwise cutscenes will crash the game.
Alternatively you can use something like Distrobox to make a container with a distro that runs GLibC 2.38 (like Ubuntu 24.04)
You probably experienced a bug where the song doesn't end and just restarts, and those transparent notes are notes you missed wrapping around. Don't bother trying to hit them because you'll just miss so leave them be.
Haha, no idea why they never made one. Probably trying to figure out an error with GLibC and shit (such error is why I made my own port and hence the name "legacy Linux")
Also anyone with enough knowledge can make their own build of the game, I'm just easing up the process.