Starmash is a top down multiplayer missile warfare game.
As far as WebGL goes, the most interesting thing technically is the map. It is a 32768x16384 map of the world generated dynamically by only 1.6 MB of downloaded data. (No Antarctica though )
Network wise, the netcode is very efficient and can handle hundreds of players at the same place.
Play here: https://airmash.online/
Play here version 2: http://starmash.test.airmash.online/