I just show you my little project, sorry if my english is bad but its not my main language.
Warshoot is a multiplayer 2D shooter, i use HTML5 with canvas for make the client and for the server, i use nodejs with socket.io.
Little presentation :
At first you please choose a team, you fight against the enemy team on the map is diverse containers containing bonus improvements. When you kill an enemy you earn points, these points are redeemable against weapons, appearances ...
Nothing beats a small démonstration : http://warshoot.servegame.com
(This démo is 10% of the game)
Use the directional keys to move, left click to shoot and G to use grenade picked in containers.
I posted here to maybe find a 2D graphic. Currently the graphics are ugly.