I was just browsing through the interweb in order to search for Html5 game engines review. I am delighted that someone just helped me a great deal by puting this up for review! Great crowdsourcing approach right there! Thanks to Clay.io!
Here are a few links to websites dedicated to Html5 game engines reviews:
http://html5gameengine.com/
https://github.com/bebraw/jswiki/wiki/Game-Engines