Unfortunately for me to "sign" the game to allow it to run on Mac, I'd need an Apple Developer license, which costs a lot of money I'm not keen on spending.
If you would like to play the game on Mac, the Windows version runs perfectly through the application "PlayOnMac" and I've been told runs through Apples own "Game Porting Toolkit" though I haven't verified that.
I'm terribly sorry for the inconvenience but until such a time that Apple makes running unsigned Mac apps more intuitive or allow signing without a costly $100usd developer license subscription, I won't be releasing a Mac version.
It's really frustrating as I do have a Mac laptop myself, but this is what it is and Goodnight Tea isn't profitable enough for me to justify the expense and compromising in my morals.