I think you started with something simple, but quickly found you needed to add features for it to work properly for you - and I'd guess it is more-or-less complete for your use-case now. The documentation is a reference for all the features. But it's difficult for a newcomer, to see the full complexity of the end-product, first.

Echoing the root of this thread, I think a tutorial would help, covering the simplest and most common features first (and the ones that work most neatly and elegantly). I'd suggest, for every example, have three parts, in the order a user would experience them:

  1. user-entered shortcut  e=mc\^2
  2. unicode appearing      e=mc²
  3. an image of pdf

I'd omit the actual latex from this tute, because the user never actually sees it...

Yep, this initially started as Pandoc filter that iterates over math elements and applies regex replacing. Then I switched to Panflute to iterate over math easier. And eventually added {, } counter with left, right and center regex patterns for binary math operators.