More EQ separation pls
You totally neglected to separate the elements of this piece using EQ and stereo pan. While you certainly achieve a good hardcore effect, dedicating say, the highs to the high hats, the bass to the bass, etc, the individual elements would be much more separate and recognizable. The same effect could be achieved differently by dedicating each aspect to a particular left/right ratio (Ex. the bass centered, and the high hats to the left, and the snare hits to the right)
The piece is also a little too fast to let the elements soak in. Slow it down a bit so each note has a distinct attack and decay. That way the tone of the samples would really shine through.