Did you extract the game files from the .zip?
Hi, thanks for responding - I ended up finding a solution.
I downloaded The Unarchiver and extracting the game files via that somehow made the application executable.
For anyone else who might be stuck, perform these steps:
1. Find The Unarchiver on the Mac App Store and download it.
2. Downloading the .zip will automatically extract using Archive Utility (default) and will break the file, so ignore it and right click the .zip - there should be a drop down with Open With -> The Unarchiver.
3. The game should now function.
I have no idea why this works... but apparently making .zip or TAR archives with inappropriate settings will strip many file attributes.
