I ran a weeklong D&D camp for a group of 10-13 year olds last summer, and A Dragon Game would have been wonderful to have in hand. If we repeat the camp this summer, I intend to use your rules - they allow the mechanics to not be so front and center and consuming, and let players and DMs just enjoy playing. I’m really happy you took this on.
In terms of expansions, why no races? I think players really like that aspect of gaming and it adds an interesting and diversifying (?) element?