As threatened, Asteroids!
Update: You don't need coins, you can press [f] to start. Apparently I should have made that more clear.
Sorry no sounds, shields or extra weapons, there are already other good asteroid games for the HTML5 canvas. I wrote this to try CoffeeScript, which has been quite fun. I posted the source as a gist.
I have some ideas about how I could make it multiplayer which I might consider trying, of course that has been done too.
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A trip down memory lane!