Goddamn adorable pixel art, very well done.
Fluid controls, I especially like the fact that the movement speed is almost perfect.
Decent music that fits the situation.
Very short and simple.
Little to no reason to replay once the game is complete.
Overall: This is a well made and high polished game. You've obviously set out to make something short, sweet, and nostalgic, and you've done that well. However, that very premise prevents it from jumping from "good" to "OMFG awesome". And that's okay, as trying to make this game more than what it already is would hurt that sweet, simple image and only mar the experience.