the Mac version of the game does run on Catalina and above as it is 64 bits, it does have a permission issue though, here's how to fix it:
- right-click the game and select "display contents"
- navigate inside the "contents/MacOS/" folder
- open terminal and type chmod 755, don't hit enter just yet, and drag and drop the file BffOrDie from the contents/MacOS/ folder on the terminal window, then hit enter
you should now be able to launch the game (you'll get a gatekeeper alert, which you can disable by right-clicking the game and selecting "open", then click on the open button).