Maybe a timer on each level? I could see two badges then, one for completion, one for under a "par" time for each level. Nice game. Well done with the design and feel.
A fun little game. Nice idea and decent design. I like the fact that the graphics do not require a supercomputer to run when several things are on the screen.
I agree with Pvblivs about the boxes. That being said, I also appreciate the randomness of the game. An interesting game that has only one action. This is a great idea. Really. Whatever other flaws this game might have, give props to the great idea.
I like the game, but it would be nice if the control buttons were not on the game space, so I don't accidently add a track section when trying to change to switch mode. Maybe also a bigger playing space. Otherwise, very nice.
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 "Thanks Tanks!"){kind=icon}
 "Icebreaker"){kind=icon}
 "Canabalt"){kind=icon}
 "Railway Valley"){kind=icon}
 "Bearings (Move the Ship)"){kind=icon}