I'm curious as to why more WebGL games aren't popular? Is it due to the infancy of the WebGL scene or is WebGL just not capable of creating great games yet?
I suppose it's mainly due to the infancy of WebGL. The technology itself is well capable of creating good games, which I hope Keep Out! helps to demonstrate.
While this is certainly an impressive demonstration of the WebGL platform, I find the game itself to be not much more than that. Lots of potential, though!