This is good work, has potential. Each tune is different enough for it to feel varied as an EP, but not so different that it becomes disjointed.
I'm not sure the 'one tune from each sub-genre' thing comes through, dnb is a lot broader than just what you've got here. It's a bit like you've taken every genre and sort of diluted it with 'normal' dnb, but that's what holds the whole thing together, it'd all be too different otherwise.
Maybe the snare in the first track is a bit dominating? Could use one with a shorter tail?
Sound design is pretty good, no faults there.
I feel like maybe a bit more variation is needed between sections: maybe a sort of ABAB... structure might be better: keep the same bass lead and drum sounds, but get them to play different notes and rhythms.
Just my two cents... let me know if you agree with me or not.