Great design
I love the metal look and the little walking robot.
The interest of the game, however, is limited. Is there a way one can loose ?
I was thinking on making a game with gears myself, but never found any solid "playable" idea.
By the way, your gears look great but would break in any decent mecanical engin. The teeth are supposed to curve following a "Circle involute" curve. Mathematical parametrisation can be found (in french) there :
http://www.mathcurve.com/courbes2d/de veloppantedecercle/developpantedecerc le.shtml
I (proudly) did the little 3d stuff at the bottom of the page. I also wrote a script for 3dsMax that creates gears based on circle involutes, if you're interested.