There are a few things that I felt were missing. I bring this up, because this is the kind of feedback I'm always looking for on my projects:
1. The publish URL faded away and I hadn't copied it, so I lost it. I realize I can hit Publish again, but I'd like it to still be there without me feeling like I had to Publish "all over again" (I realize it's one click, but that's just how it felt).
2. I had the weird urge to delete the document before I left. I feel weird just "leaving it there" if I don't want to keep it.
3. Clicking the "New" button from an existent document seemed to take forever to load... Maybe just make it a link to the domain?
Well done!