Mozilla are trying to push their BrowserID on the world though. A fairly popular (among devs) technological demo seems like the right place to start that; it'd show us how easy it is for users to use, and how simple it is to integrate. Not using it is a wasted opportunity.
This demo is really for HTML5, not for BrowserID. BrowserID might add an unrefined and unnecessary hurdle to the game. Then all the other platform dev's and press will say silly things like HTML5 requires BrowserID or something.
And this is actually a nice little game. Buy then again, where is browserid and open badges support ?