Tweaked some physics values,  Turned off gravity, Added some LinearDamping to simulate topdown friction/gravity.
Refactored a bit more.  Cam/World functions in camera.js.  Entitiy stuff in entity.js.  Added entity factory.
Adding subclasses of entities:  Player.  #WantTheLastHourOfMyLifeBack  -- javascript sucks for inheritance.  Working game now. but nothing fancy.