[atlintots]

This is great! Are there any other similar tutorials going through writing a Haskell program, but with some more advanced features (monad transformers, lenses, etc)

[trealira]

I would recommend the book Haskell in Depth, which covers both of those topics (monad transformers by chapter 6, lenses in chapter 3 and chapter 14). It also covers some other advanced features, like Template Haskell and concurrency, and has a chapter dedicated to working with SQL databases in Haskell.

[mirpa]

You might try: https://github.com/turion/rhine-koans it is tutorial for FRP library Rhine, well commented with tests