I really enjoyed the speed of this piece. The time signature is actually 12/8. I know you've been told to change it already, but from the musical knowledge I have, it sounds like there's 12 eighth notes per measure or 4 triplet eighth note groups. 3/4 sounds like it ends halfway through a measure to me. Just thought I'd clear up the confusion.
The piano samples were mixed very well. They had a very nice amount of reverb on them which helped fill up the space where they were playing alone. The melody is also very nice. Overall, the intro has a very atmospheric feel, which I quite like.
The speed at which this song flows is also nice. It has enough time for you to get familiar with each section before moving on to the next, which is a great characteristic for a song to have, although it isn't practiced much.
The mixing was very good. All of the instruments were clearly brought out. One thing that I liked was the way the drums were used from about 0:18 to the drop. They had a nice filter and volume cut on them which helped keep them from overpowering the other elements. They were then mixed in very well at the drop.
The only thing that I would change is the instruments used. Yes, the instrumentation fits with DnB, but I would have liked to see an unusual instrument or two. It's more of my style to do that, and it's not necessary at all, but I think it would have added a unique spin on it and made it your own. I don't listen to a ton of DnB, but I still hear the same sounds and instruments every time. This isn't really a flaw, it's just something I think would have made this piece even better.
In the end, this is a very well made piece. I really have no complaints about how this was made, but it has a very predictable DnB sound to it, and that's one thing I'd think about changing up a bit. Otherwise, great job!
9/10