Posted this in the main game description as well, but it appears to be an Apple Certification issue that can be avoided if you run the game in the Itch.io desktop app:
MAC Users: **We are working on getting Apple Developer Certification. Until then, the best solution Itch.io has recommended is to download the itch.io desktop app:
and run the game from inside the app. This seems to solve the "this file is corrupted and should be trashed" error some users are getting. Apologies for the inconvenience as we navigate Apple Developer Funland!
Let us know if this solves the issue.