Of all the metroids I've seen on the site, this one would have to be one of the best. You should experiment with some more manoeuvres, rolling and blasting etc...
hehe very nice, was dancing perfectly to a song i was listening to, then i changed it to uhn tiss and it doesnt seem to fit. :( Either way very nice animating.
It's not a cheat code. At the end of the first Metroid, she takes off her outfit and is revealed to be a girl. The cheat code you are referring to is "JUSTIN BAILEY" where you can play as Samus in a leotard with all the power-ups.
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This guy is too professional for advice.