Thanks for your feedbacks! And you're right about needing a favicon soon, it's among the top items on my todo for design at the moment.

If all else fails though, I'm glad that I might have a career as a children's author! But really, thanks for your kind words about the illustrations and story-telling. They mean a lot to those countless drafts of redesigns and rewrites.

I especially like your idea of publishing a book version as a companion to the web. If the app grows big enough, I may very well do that!