Um, way off
Well, this doesn't sound like a premade midi, and it sounded like it took tons of time, but... you missed a lot of content and tons of the notes were wrong. Please, just search for an mp3 of the original, or listen to the game (emulator, or system) so that you can get the notes right, instead of being foolish and trying to do this from memory. I definatley agree with the guy below me. And yes, many of the instruments sounded like MIDI synths that didn't have much dimension. It was also too fast. Honestly, i am NOT sorry to give you a 0/5 and 1/10, because this was unbearably bad.
Although i used a Pre-Made midi, my version may be a much better example of both instrument choice and better synths: http://www.newgrounds.com/audio/liste n/250437