'It has a really nice.....'
late 80's / early 90's house feel to it more than d'n'b though...
Not that that's a major problem... My main advice is work on the chords at the beginning, cos there's a note in there that's throwing everything else off...
Reconsider this track.. stick a thumping heavy bass line under it, heavy bass drum and reconsider the arrangement and i think you've got your self a winner.... (it does sound a bit like you've made some 4 bar samples and just wacked them together..)
you get high marks cos it's a great sound for your first track.... very nice high level of production on it...
Not far off the mark at all matey.. Maybe see if you can get one of the big guns to try and help you out... i'm sure someone like housemasta can see the potential in something like this...