Was the dissonnance intended, or not? Because the melodic synth doesn't really sound happy, it sounds disturbing. Also, for a dnb song, where's the bass? I hear the percussions, but not the bass?
I don't mind the percussions here -- they can be used for something good. Those synths (or strings?) droning at the back could be used for something fantasy-like. But I really don't know what to say about the combination you've used here... It is a bit hard on the ears, I'm afraid.