Meteor and Firebase and other novel web app frameworks are one thing... MMO Asteroids, or any multiplayer game, is another. Game developers have been doing multiplayer for a very long time; the frameworks promise to blur the line between client and server, but MMO Asteroids is still trivial with traditional client-server code, without any funky security model, making it a bit of an odd showcase.

Anyway, I doubt those frameworks have lag compensation (https://developer.valvesoftware.com/wiki/Source_Multiplayer_...), so good luck avoiding jitter :)