From the Author:
Ninja: the script of java is a co-op vertical shooter.
The game development has been incepted and driven by my 7-year-old son who asked me a couple months ago to teach him how computer games are created.
The source code and offline version are available at http://code.google.com/p/ninja-the-script-of-java/
The russian version is available at http://bychenkov.ru/ninja/