Resources to learn more
Walter Higgins, the creator of ScriptCraft, has a book (officially coming April 2015) that goes into more detail than this quick overview has.
3D Game Programming for Kids teaches the creation of, well, 3D games. All of the code samples can be edited and run right in your web browser.
Khan Academy offers a collection of free lessons in programming with exercises that you can write and try out in your browser.
I haven’t tried it yet, but LearnToMod builds on the same ScriptCraft environment that we’ve been working with. But, it looks like they run ScriptCraft for you, which saves you the trouble of running ScriptCraft locally. They have “hundreds” of lessons. Looks like a good deal at $30 per year.