I actually really like this app and so does my student. He is really into cartoons and can read well, so he flies through the topics. I was able to use this as a teaching tool for 2-3 months until it started taking FOREVER to load on my iPad. I have updated my iPad and tried restarting it, but it's still not loading. My student keeps asking me when he can play the game again and I have to tell him we can't play because it won't load for some reason.
As for using this app on a phone, it's worthless. You can't access any of the buttons easily, if at all. It doesn't fit on the phone so be sure to have an iPad.
If the creators could fix this loading problem, and maybe take out the video that plays in the beginning... I would love to continue using this app.