Multiplayer Hack'n'Slash with hand-coded graphics ;)
Tested on Chrome 23, FF 16 & IE 10.
After opening site you'll be prompted to enter name and color (optional).
To create an arena click 'New arena'. To enter an arena click it's name.
Movement by WASD, direction by mouse, left mouse button: fight, right mouse button: block.
libs: socket.io, box2dweb, express, jade, stylus & nib, underscore, Timer.js (github.com/fschaefer/Timer.js)