Something promising
First I thought while reading your comment (very breifly) that it would be the fiftey-eleventh crappy Metroid sprite movie, then I was wrong. The graphics was very good, although Claire (part of Robotnik's machines from Sonic Advence 3 I think) look kinda missplaces and big. It was kinda funny that you addes sound effects for the movement and added a kinda 'cartoonish' style to it, also the idea to limit the actual sprite-animation movement to a minimum was a smart move. The only things I dislike is the Metal Slug-explosion, it looks so misplaced it just gets ugly, and the use of the 'Back to Mad' by Texas Fagott, ever since Andrew Dickman used it first in Rockman NEO it's been spreading the portal like an disease, try to either use some of the audio from the Audio Portal or get some Metroid remixes from OCRemix.org instead.