Thank you for bringing this to my attention, I see the misunderstanding. Each demo corresponds one of the tutorial videos, and I have only made the first two so far. The third was going to include those features you mentioned, and the playable demo on this page was just a preview. However, I haven't continued this project, so the third installment was never uploaded. I'll find the file and upload it shortly. Although, fair warning, it was designed as a demo rather than a teaching tool, so it may not be commented as thoroughly as the others. If and when I continue this series, I'll replace it with a more organized, teaching-focused product. Thank you for your patience and I hope it will be helpful to you.