I think you're downplaying the fact that many people still view computer science with mystery, fear, and antagonism. Improving pointlessly negative cultural attitudes from a young age is a worthwhile venture, and I wish someone would do it with mathematics as well.
I didn't understand the mathematics, but I thought the cartoon characters were delightful. They made me want to learn math, and I could hardly wait until getting to calculus myself, so I could actually understand the book.
An educational app for children's mathematics has been on my mind for years. But I always thought the market was too small. The success of this story is making me think about finally writing one, maybe less technical and more adventurous.
The funding level validates the kickstarter and the video not necessarily the topic. I totally support thoughtful, engaging intellectual children's apps. Build something small and see how well it sticks, iterate.