Hey hey! Sorry my reply is pretty slow >.< I just had a busy week last week with a family wedding + my dad's birthday. Hopefully you managed to get it to work by now, but if not, I made a guide on the main game page for opening the game on Mac, though, this version is slightly more updated with additional solutions: https://melancholy-marionette.itch.io/darling-duality-winter-wish/devlog/227880/...
Unfortunately, it seems like it's really awkward to open all of my games on Mac :( I don't own a Mac, so I can only test on Windows, but various Mac uders helped me to put the guide together, and so far, I think everyone has managed to get it to open using one of the bits of help on the list :3 I would recommend trying the first one first just because a few people have recently told me that was the easiest solution that worked for them!
Thanks so much for checking out the game and I hope you can manage to get it running :3