Just heard about this on the Hello Playdate Podcast and it looks like the PDX foldername contains a colon and the side loader doesn't like that, so I unzipped the zip. renamed without the colon, re-zipped, and that seemed to work. Now to play it! :)
I kind of skim-listen to that podcast, but IIRC, in a recent ep, they talked a little bit about your original game and how this version is less depressing (or something along those lines). Anyway, I sideloaded it and it's waiting for me to stop working so I can try it out. :)