The existing courses are great but they can be quite challenging for kids under 13.
As a mentor at CoderDojo, I see a lot of kids aged 7-12 who are very interested in game dev, but struggle with the main engines particularly with OO programming. We have a lot of success and fun with engines such as Scratch and Stencyl, which use visual programming metaphors to assemble code out of blocks.
Parents are also very keen to support their kids in learning programming through game development, and are quite prepared to invest in Udemy courses in addition to the free instruction they get at CoderDojo. I’ve sent quite a few new students to GameDev.TV courses over the last 2 years. You’re welcome
A structured course similar to the Unity course which targets kids 7-12 and takes them up through Scratch and Stencyl to build a half dozen polished games that they can build on would be a great feeder to the other courses, and from my experience would be very popular. This could perhaps even include Unity+Playmaker, continuing the visual programming theme, though I note that Playmaker has a cost associated (which again, from experience, parents are quite willing to pay).
Happy to discuss on Discord etc.