Drum fills sound great. Interesting choices for the chord structure. Def is a new concept at drum n bass. Nothing like I've heard before. I enjoyed it.
Possibly some constructive criticism:
As drum n bass is concerned, that 'punchy' feel is what you want to aim for that really makes you bob your head. I think the drums could've been a bit more punchy. The frequency range you had going otherwise all matched up nicely. I'm not sure if you were going for that softer sound or not since you named it new concept.
If you'd like, you can listen to my newest drum n bass song and give it some feedback. I'm not really sure how it sounds to others as not many people have heard it. Some criticism, ideas, input, whatever, would be appreciated.