There seems to be a problem on MacOS where the necessary save files aren't being included in the download? Can't seem to find a fix to this and it prevents me from progressing any further than the title screen
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There aren't any save files that are included in the download or needed for the game to run. But from the sounds of things, you might be getting the "EROFS: read-only file system" error.
If that is the case, make sure you've actually extracted the Zip file first. Right click (or ctrl click), and open with archive utility. I think that's the software. Once you have, drag the app into your app folder