It would be cool if you could play against a person you know. Maybe by having a custom link for a specific game/room. I have been working on a similar idea with different board games with node.js and socket.io. What are you using for the backend?

Yeah I was thinking about allowing users to pick or create their own games. But this kind of game is for quick play while on a transit or waiting at checkout line :-) so I don't want to make this a feature. I use Jetty at the server side. I just randomly match users with each other. That's why it needs to have at least a user to bootstrap.