tutorial level 2 complete
tutorial level 3 complete
completed tutorial level4 - rotate view
add sidebar to game screen
Update to newer version of Physicjs - was getting the follow error

Uncaught Error: INVALID_STATE_ERR: DOM Exception 11

Seems to be done to a newer version of chrome since I last visited the code.

There an evening spent debugging my own code I'll never get back...

Glad it was fixed in physicsjs though.
Changed the "lookat" position of of the camera to be near the origin to make the rotation feel more natural