I'm really sorry, but Mac asks for a paid dev fee to publish games for them. As I'm a solo dev making small games, it's not economically worth it for me.
On itchio nobody from Apple will check if that fee is paid or not. The other way around this is making an "all-operating systems" build for Steam. I can't put a tick on "Mac build" on Steam, but it might work on Mac computers, as it works for Linux users.
Anyway, I strongly recommend purchasing the game here, where you know you'll be able to play it, and claim a Steam key from the game page to try it on Steam.