A few things to keep in mind:
While this is generally solid, I would have liked to see some variation in which synths you used.
The stuff you opened with, you used for the entire song, which to some can seem a little bit boring. Maybe you could've shaken things up by adding a few more voices (while at the same time subtracting the existing voices), giving a different flow at times. Experiment, you know?
Anyhoo, this is not all that bad, and fairly enjoyable, but keep on improving!
PS, Super is one of my favorite games too. I'mma a huge Metroid fan, so I can't fault you for having bad taste!