Not saying this isn't awesome... but don't there seem to be more HTML5/Javascript engines/libraries/toolkits than there are actual decent products or games?
Until there's a clear "winner" in the space, I'm happy to see more engines come out, maybe one of them will finally get close enough to a general purpose game engine that it will see some community involvement.
I wanted something minimalistic and clean, without any dependencies. And I didn't want yet another "classes for JS"-pattern forced on me.
JawsJS is really picking up speed now, I know quite some ppl that used it for the last Ludum Dare.