I reckon we should stick with pure 2d up to the point where we could build a full game. Then we separate out the rendering stuff to allow us to plug and play a pure 2d, 2d+3d or fully 3d FPS engine in. Looks like a very cool effect mind you! (although we could make a start on this separation now I guess)
As for it being slow, just add it to the options to be able to turn it off.
As for it being slow, just add it to the options to be able to turn it off.