Not so much raw DnB but more like hints of DnB fused with Ska... which isn't a bad thing at all x)
For a first attempt at this sort of thing, it actually isn't bad - appropriate instrumentation, great flow, and managed to show its greatest energy when the melody ends up as the primary focus. Those are pretty good arrangement ideas for sure.
Can't say I was particularly keen about some of your low-key transitions here, or rather that outside of the progression it felt more like a 2-loop variation of the theme given the DnB treatment. You do however tend to acknowledge your mastering weakness a bit here - for the most part it actually sounds fine, though one tip for the future is that your individual parts need to be a lot less muddy. In fact, everything except the kick would benefit with high-passes around their general frequency (e.g. snare's case, around 200-300hz, hihats around 5k depending on pitch); not only would they have more of a punch, but it also gives the other instruments around that range some time to come out themselves.
Hopefully this comes out okay - nice work either way :)