Hello there!
I don't own a Mac, so testing macOS builds is impossible for me. If there's enough demand, it's something I would definitely look into it, but the price point makes it tricky. An emulator like Wine should work for Shadow Bonds 😊
And for Linux, Proton should work as well—Shadow Bonds runs on Steam Deck without any issues (or so I have been told, I don't own one 😅)