Good job!
The concept is great, and it will surely do well with an age appropriate audience. While it is not the action packed shoot-em-up, it still does well to add an educational element and still be entertaining. The banjo, though, did start to become a bit annoying. Maybe adding a feature to switch to a different style of music might make it a bit better. For making a game that is not only entertaining, but possibly educational as well, I'm giving you a 10/10.