maybe its the version of your mac like for example: "version 1.7.00" and the game can only run on different versions, you could also go to settings (System Preferences) and press security & privacy, at the bottom left theres a lock, click it and enter your info (ex: username: Kuromiku password: 123456) then go to "allow apps downloaded from:" and click "Anywhere" then click the lock again and enter your info again, that will save your changes and it might work. If it dosent retry a few times and check to make sure you saved changes.
Hi there! I was having a similar issue with running apps on my Mac. It's a Big Sur bug that is putting applications in quarantine. The instructions here fixed it for me: https://stackoverflow.com/questions/64842819/cant-run-app-because-of-permission-...