The entry that Chris Granger (ibdknox) and I submitted is Node Defense: http://wrench-labs.nko2.nodeknockout.com/

The lobby is actually a full-on chat room (a la old school blizzard.net) and the game itself is all custom code (no libraries for the canvas stuff).

A full list of everything we used is on our entry page: http://nodeknockout.com/teams/wrench-labs

(And updates are coming as soon as judging is over!)