Hello Annie,
Sorry that you are having trouble running the game on a Mac, while I don't have a Mac at hand to be able to test the problem - if you are running MacOs 10.15 Catalina, then it might be because the game is not notarized.
You could try downloading and playing the game through Steam, while we try and figure out what the problem might be : https://store.steampowered.com/app/1249300/The_Indifferent_Wonder_of_an_Edible_P...
Hope that helps!
Dhruv.