I've just pushed a fix for the macOS build which removes the signature. I wasn't able to test it on another Mac (every other one I've got runs Mojave or earlier), so there could be some lingering issues. Thank you for bringing this to my attention in the first place!
Viewing post in macOS Build is "damaged and can’t be opened"
I just tested this on my Apple silicon Mac (M1 mini) and it doesn't run even if I right click it. I had to manually ad hoc sign it to allow it to run, because Apple silicon outright requires signatures even on your own local builds to run them. In fact, Xcode ad hoc signs everything it links these days. (I've been told I overexplain things, sometimes even to people who already knew those things. Maybe it's sometimes helpful for information to be available in lots of places, though. Especially with Google circling the drain as it is.)
I'd be willing to help with notary signing, but you should probably do that yourself if you can afford it, since the signature does expose the name of the person or team that signed the app, unless you're using ad hoc signing, then it's an anonymous machine specific signature.
Just a minor hint that seemed to pop up when I was checking the signature myself, it seems it may be objecting to a signature having been applied to the DOSBox bundle prior to the settings files and resources being inserted. It needs to be re-signed after everything is embedded proper. Hope this helps somewhat. (And this would definitely be breaking the ad hoc signing if you were just using the link time auto signing of the bundle.)
Oh, that's not good to hear; I don't have any AS Macs around (nor the funds to buy one), so if app security works differently from an Intel Mac, then I can't test that at all :(
Just double-checking, this on the latest v1.00-1 build and not the one from when the game was first released, correct? It shouldn't have a signature at all (though to be fair, I never recieved confirmation from anyone that it worked after it was updated). I was under the impression that unsigned apps would still run, but only with Gatekeeper disabled and opened via the right-click menu. But if this isn't the case with newer Macs, then I may just remove the build entirely as there's too much time, effort, and cost involved in making it work properly.