I decided to see what the error was myself. I installed macOS in a virtual machine, and game works. Try to launch the game through the
Beat Banger.command file.
UPD:
Your problem isn't the game developer, but macOS's quirks. Here's how to fix it (or just use
Beat Banger.command):
You must be registered to see the links
Next time, at least try to google the error messages and check the solutions. If I, who's never dealt with Apple OSes before (and don't have hw), figured it out in five minutes (not counting the time spent setting up the VM), then someone who regularly uses macOS should be able to figure it out, right?