Ah, I'm sorry to hear! I don't know much about macOS and how to bypass it or make the game work in that environment.
I searched, and if it's about unknown developer verification stuff, seems like it could be solved with changing some settings? There's also about using the Itch.io launcher instead if you mostly get games from the website itself. If you have tried both and it still does not work, then I apologize, I can't help much further!