Hmm
I'm trying to figure out if you just took the midi file, ran it through your samples, and put it in mp3 form. Although I am pretty familiar with the music from this game (I used to use it personally for game music analysis), I don't feel that I am personally in the position to call you on this or not. If you rescored it all out you did a great job, and could find yourself a job in the cellphone ringtone industry. I'm not sure why you would rewrite this though, because it is extremely easy to throw the midi into any notation program or sequencer and work from there.
I put a 5 in all the ratings because I don't know exactly how you went about this, so just ignore that. I didn't cast a vote on your piece to raise or lower the score. Just be aware that if you just ran this through a sequencer that is copyright violation (in fact, it most likely is already), and violates the Newground submission rules.
At any rate I am interested in hearing more original works from you!