Very nice, and a remix that really makes me wish I had played the original game. (Yes, I know, I'll see if I can get my hands on one.) As DiscoDan had said, samples are extremely high quality...repetitiveness is rather high, but with just enough flavour between reiterations to qualify as something other than pure background music.
I give 7/10 in total quality; a touch more length would have been excellent, with perhaps a bit more in the way of variations on the theme.
And for the record, this reminds me of Trapezoid's magnum opus as well; I can't imagine why aside from the obvious reasons of instruments, beat, and how it's set up...