I personally really like the overall idea! I feel like the hook isn't strong, but the gameplay is ok, it just takes some time to get into the flow, and there aren't many things keeping the interest in the game, it get's boring at times.
I also have a question, how kid-friendly does this have to be? I was assuming enough to pass the scratch team, but considering how sensitive they are and the fact that I'm not 4 years old (I swear), I figured you'd have a different standard.