Does this occur even if you right click on the game and choose Open? As mentioned above in the download instructions, there wasn’t enough time in the submission window to notarize or sign the binary with an Apple-approved Developer ID, and this may cause your Mac to reject the game as untrusted unless you bypass it by explicitly opening it from the right click menu.
I’m currently stuck in an Apple support queue because I can’t access the control panel I need to to sign this binary. Modern Apple development can be such a pain…
In the meantime, I will do everything I can to get you a build that works for you, but can we switch this conversation to email? Message me at kirbykirbykirby at the google mail service and I’ll directly send you builds to test.
I’m deeply sorry about all of this!