itch.io

Just click "More info" and run it anyway

Ah, built in firewalls. Always assuming that if it's an indie game or online it's malware. Don't worry! I believe it's fixable. If it's anything like windows firewall, what'll happen is there should be an option to view more details and run it anyway. Just for the record, if this doesn't work, I don't use mac, so this is just my best guess.

It thinks it's a virus, just play it anyways. It's perfectly safe for your computer

Fixed!