Last semester we did a project with Google Web Toolkit where we need to design an educational game to test out the Uni’s new MUGLE online game engine. My team’s was called “Mechanix”:

http://mugle-app.appspot.com/+games/p-robot/Mechanix/

While the educational value of the game has little merit, I think a lot of the work was put into a decent physics engine which was fun to make.