Beautifully executed, I think a progress mechanic is needed before it could be called a game. A distance traveled counter comes to mind. Also, Vector3.forward has a default value of 1f, so the code could be distilled a little more by removing the *1f.
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Thanks! Great suggestions too. You should try out Post-Modern Warfare... http://www.kongregate.com/games/Techsuport/postmodern-warfare