Will be a good idea finish the Box2D support with all Box2D features and add LiquidFun ( LiquidFun ) to support 2D rigid-body and fluid simulation.
And examples of 2D shaders and 2D light with shadows and light/glow support OpenGL 2D lighting using shaders - YouTube Real Time Lighting - C++ / OpenGL / Box2D - YouTube or different types of light to 2D.