So yeah this boots and runs just fine on M1 Mac, BUT - I'm not able to save any files. The dialogue pops up, but it just won't save. Can you please double check this at your end Tom?
I notarized the macOS version!
So macOS now requires apps outside of the Mac App Store to be notarized. The process wasn't as easy as I'd hoped, but I got it working. That means it should run without having to allow it in the Security panel! If anyone still has issues running it, let me know!