Nice this is awesome I dabbled in iOS dev one summer but my simple apps looked horrible. If you can find something that targets children the parents will buy. When I worked in a restaurant you wont believe how many parents would just give the kid an iPad/iPhone so they would calm down, worked immediately.
Kudos for making an app that actually has the kids learning instead of some trippy cartoon to watch.
2.99 is a good price to pay for a decent app any more and I probably would look for something else, the days of .99 across the board are long gone.