It would be good to test the direct USB transfer via Vitashell on Windows and see if it is just a problem with MacOS. For some reason, my Vita doesn't show up as USB stick anymore if I enable it in Vitashell and connect to my Windows desktop. So I can't test it myself.
EDIT: If you want you can play this game for the rest of your life. There are 3,201 levels in this Vita version.
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