I think I see what you mean, but isn't that just the effect you get on older monitors, sometimes called "ghosting"? It would probably look worse on laptops.
I think the blurry-ness is lessened by reducing his speed.
Also I don't know if it was intentional but there's really no need for a separate / pegged player object.
I got rid of the player object and fixed some of your animation (it was jerky because you had bounding box different on different frames of "running").