I think it would be fun to create a version of this which pushes writing towards other recognizable styles like Raymond Chandler or David Foster Wallace. Maybe you pick a style from a dropdown and the analysis changes. You could possibly take it even further and automate some transformations of the input to stylize a piece of writing.
To satisfy a DFW style it'd need to understand 2 page long sentences with multiple footnotes per sentence. Haha. It would be a fun one to do though! (I say that loving DFW)
