It's been too long since I've written a 'good' review. As usual, automatic 10. Gives the illusion that no matter what I say, it's always gonna be good cause there's a 10 right there ;)
Arrangement wise, this song was very solid but there were some really funky parts. I wouldn't call them holes in the arrangement; in fact, I'd call them unnecessary additions. The beginning is great; 16 bar introduction with 8 bar intervals between introducing new instruments. But at the part at 2:09, where you slow the song into half time, and I sat here and counted it out several times... I thought it sounded kind of weird but it turns out that you don't have a 4 bar segment there, you have a 4 bar and 2 beats segment! Honestly, musically that's entirely fine. But when I'm listening to a drum 'n bass/ breakbeat song that I'm expecting to deliver a solid groove and then bam, there's two extra beats, it makes me feel kinda funny on the inside.
I like your choice of instruments! Very good riffs and even the drum work is above decent. I see that you've got the whole panning the hi hats down good, but remember to never have too busy of a kick drum. Another song I reviewed a long time ago was a drum 'n bass track with really really busy kick drums. Double pedal worthy, almost. He replied in my review saying that he meant to have a busy kick drum since, being a drummer, he was able to play it. That busy kick drum almost creates another genre though. I honestly think this is much more breakbeat-ish than drum 'n bass, but the drums create the illusion that it's a fancy mixture. Plus, a busy kick drum has the potential to drown out the bass synth.
Go get yourself some better samples and you'll sound amazing. Good work.