what mac do you have and do you get any error messages? I'll try and take a look to get the mac version working
sry for taking so long, but i have a Early 2015 Macbook Pro, when i try to run the game it says "The application “Boaty McBoatface Island Adventure 2” can’t be opened."
It's a long time since a reply but I think I've got it figured out now so it can run on the mac. Please grab the new file if you're still keen to play, right click the application and select "open", it should work fine. I've just tested it on macOS High Sierra as a virtual machine and it launches OK.