itch.io

this same thing happened to me but theres a way to fix it. go to "system preferences" (it looks like a gear or settings) and click "privacy & security" in the "general" tab.  Open the game and the message you just had should appear.  it will say "'(game in question)' was blocked from opening because its not from an identified developer" click "open anyway" it will ask you if you are sure you want to open it, click yes or open anyway (make sure its not cancel because I kept on doing that lol). Once that is done click your lock to make changes.  Apple will ask you for your apple password as safety precautions.  Once that is do you should be able to play.