Pixel bleeding? Are you referring to color distortion caused by the use of composite video? Why would you expect to see that in a screenshot viewed on your LCD screen? You'd have to actually see the game output via composite from a Mega Drive to a CRT to see it (which you would, since the art uses dithering well).
This is one of the best-looking Mega Drive games released in a very long time, developed by the company responsible for games like Streets of Rage and Beyond Oasis.