I'm already uploading a separate Mac build, but if you don't want to wait, here's another solution:
The reason the game doesn't run is the quarantine imposed by Gatekeeper. You can remove it in Terminal with the command
"xattr -d com.apple.quarantine" (without the quotes) and drag ShutUpandDance.app to the same line and then hit Enter. The game should start without problems after this. :)