Here you can ask a question to the developer (to me, I am alone c:).
When/if you are adding MacOS support for the game. You could use GitHub Actions for building the releases. Like https://github.com/ellisonoswalt/aseprite_builder.
It is very unfortunate that this happened.
I already thought about it, haha, but for now we are working on another project "Outerspace". Once we're done (during October I guess), I have plans for some kind of Build&Grow "remaster", the game is still on version 0.9. So I'm going to release 1.0 on mobile as well, with a save of the last game, sprite recolor and, of course, steam release.