The link here is to just one lesson, and I have a few more that you can find on the site. I'd love feedback from HNers with kids age 10-13 or so, or HNers who can put on an intro to programming hat.
On the roadmap is adding more complex use cases for your programs (like drag and drop web apps), and obviously many more lessons.
If you're a teacher and interested in using this with students, email me at [email protected]