That's really excellent. It's funny, although not entirely surprising, but we have also been using parts of Khan and Bret Victor. The students seemed to really enjoy the sandbox of Khan as a starter to what is possible with code. Repl.it was a big help as well. The hard/fun part is transitioning between the experimenting and learning with these out-of-the-box tools to experimenting and learning by actually making your own stuff. I - and I'm sure the other ScriptEd folks - would love to hear more about your experience (scriptednyc@gmail.com).