Hi, thanks for buying the game! Sadly, I can't export to Mac. I'm inexperienced in that area and it takes a lot of time. I hear that Windows emulation for Mac is getting good, so you might look into that.
If you're still not able to play it, let me know and I can contact support and ask them to refund the game for you. Itch doesn't have an automatic refund system like Steam does, so it may take a minute. If you wanna keep to to support me tho, I won't complain!