Neat and your service looks interesting, but I don't call this 'fixed' yet. It did not seem to scale well.

Everyone is spawning at the same point. I just see a flood of dead users. Some jerk around a little and appear and disappear. But very little interaction.

Is it possible to multiple spawn points when demand is high and separate channels/servers for various areas that you switch as you move? (like Second Life)

I believe a node.js (or something else) version could be federated, and/or clients connect to various servers as they travel.

I know this is just a toy, but it would be interesting to see this work well at a large scale.