I haven't heard of that happening to other players! Though there are a lot of issues on Mac :'( This link has different ways to solve this issue:
https://4it.com.au/kb/article/how-to-open-app-cant-be-opened-because-its-from-an...
(and if neither of these work and you'd like a refund, you can email me at [email protected] with your itch.io payment receipt!)