FWIW I found your feature descriptions pretty tight and compelling. It was cool to read through what's available and then pop to the top of the screen to see it in action (particularly the typewriter and blur modes).

The main thing I didn't get a feel for was how this works as your document gets longer, or you're working on multiple documents. If you're writing a book does the whole thing end up being in the same text area and you just scroll around? Is there a save/load?