Math game review request: AppleQuest for Android

Hello,

I’m an indie games developer, my new game
AppleQuest is all about practicing math and having fun while doing it.
I’d be delighted if you would take the time to review it.
The big idea is that instead of dreadful homework, short gamework sessions would achieve similar effect but be fun and draw students to practice more than they “have to”.

The prime target platform for the game is Android tablets, we have
ambitious goals and plan to expand to other platforms in the future.

Market link of the game:
https://market.android.com/details?id=com.pandaknows.applequestfull

Full version of the game:
www.panda-knows.com/files/AppleQuest.zip

YouTube Video:

Thank you for your time!

About the tech: The game is written in Java using the Cosmic Engine (has an OpenGL ES renderer written in Java). The IDE used is Netbeans, with the NBAndroid plug in. On the desktop side of the project the Java OpenGL bindings are done via JOGL and the OpenAL audio bindings are done via LWJGL (with some additional libraries for ogg file format support).

Note: There is no music yet and the sound effects are placeholders! (made with sfxr)