Don't expect rendered versions of Michael Cera or Mary Elizabeth Winstead (sorry, FenixDown). Visuals are directly inspired by Bryan Lee O'Malley's graphic novels, but with a retro 16-bit style. Character sprites are huge and expertly animated, right down to unique special moves and colorful (if a bit familiar) level exits.
For fans of the graphic novels, levels pack in a number of smaller details, adding another dose of fan service to a game already packed with it. You'll see characters, businesses and hints of side-plots that never made it into the movie.
It's usually a good sign when I actively track down a copy of a game's soundtrack. The soundtrack, which is composed by chiptune punk band Anamanaguchi, outright rocks and will stick with you for days. Every track fits the situation and may even cause you to replay a level or two just to hear them again.