I ran this on a day off with my 6 year old daughter and she loved it. Really simple, she enjoyed character creation. After the first game she took over GMing duties, so its very accessible.
I can't express how happy your comment made me. I try to keep my games as accessible and child-friendly as possible, but it never occurred to me that kids themselves would be able to take over and start running the games themselves. I'm glad you both liked the game, that is honestly the greatest reward. :)