I'm glad you like the idea :3
Uff It's kinda hard to build and guide people how to run the game on mac when you don't have Mac :D but I'll try to explain. The download button lead to google doc where you can see two folders Game.app, visual novel and two files icon.png and signature. Right click on folders and files and download them all. From there there is two options: or your Mac will run it or it will says something about you downloaded a files from unknown source and it won't run it. Here is the guide how to run the games that were downloaded from the internet and not from app store https://www.macworld.com/article/3094865/macs/how-to-run-apps-that-are-not-from-...
I wish you good luck with this. Hope we will think of something to make it easier for Mac users when there is release.