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Hi, Steve! On newer macOS (like Big Sur and Monterey) old method isn't working anymore, but here's how to run your game (I just modified one part of readme.txt, you can just replace the text):

## Running on a Mac

Since the app is not signed for a Mac (I don't even have a Mac), it shows "Application from unidentified developer" or even "Application is damaged and cannot Be opened" on first start. Try to open you game with Ctrl+Right Click and then Open. If it's not helping, open Terminal, enter "sudo xattr -cr /Path/To/JetPac.app" and then open your game.

More details here: https://support.apple.com/en-gb/guide/mac-help/mh40616/mac and here: https://appletoolbox.com/app-is-damaged-cannot-be-opened-mac/