Yes sorry about that! The web player for this game engine is a little bit finicky, at least when embedded on itch. I find if you just click directly on the game when it says "click to start" and then don't click anywhere else on the page, it usually works. Seems like if the game loses focus, then you can't get it back without refreshing the page.
I have tested it successfully on Safari following that method. I hope you can get it working. If not let me know and I can try to package it as a mac app.