It's quite CPU intensive, sorry for that, but it should work on all browsers supporting HTML5, so feel free to try it on your smartphone (although you might get a really low framerate if too many collisions are happening at once).
@nltimv: Hm, yeah, that could be a nice addition! I also like how there's no overlay, though, so if I would add it in (not sure if I'm going to), I'd want to make it toggleable, but if it's not there by default people won't know about it, and if it is there by default, you won't be able to turn it off on devices without a keyboard.
Nice idea, anyway!
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