Beautifully designed, except for that damn feedback button. Why is everyone copying what I think I first saw on Draftmix?

It's not easy for people to read sideways.

Put it at the top or bottom of the page so users don't have to cock their head to one side. This seems like a curse of knowledge problem---you and most of us on HN already know what it says because we've seen it before. That doesn't mean it's easy to use, though.