That's not bad... I've never heard of you, so I'll give you the benefit of the doubt, but it sounds the exact same as the original, and there IS programs that can "copy" mp3 files into Midi files.... Although, being a musician as well, I won't bug you about it.
Now for some crits... In general, you have everything perfect, all this song could really benefit from would be some soundfonts, and possibly a secondary track for the flute when it gets up high and sort of wavers, if you know what I mean.