Hey there, did you manage to play the game? I've had the exact same issue!
Here's how to make it work:
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1. Download the game
2. Open your downloads.
There should be two seperate downloads. (Game and credits)
3. Drag and drop ONLY the game file into your Applications folder.
4. Open your finder and go to applications folder.
5. Double click onto the game file and open (If it doesn't work, try command + double klick at the same time, eventually, it'll let you)
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If you have any questions left feel free to ask me, I'm always here to help! <3 Have fun playing and don't forget to save your progress! <3