Dig it
I like the ideas you utilized for the most part, the intro was definitely pretty interesting. A lot of the sounds you utilize on the bass are definitely interesting and it is pretty overall filthy (though I feel it crescendos a little to slowly and has too much sustain).
Also, I would like to see a little more variation in the drums and overall piece in general. As I can tell that this is a simple piece, I'm not going to hit you too much on variation.
The mixing is decent, though I feel there is a little too much reverb and that drums feel a bit drowned out by the bass.
Overall this piece was decent and I'm not going to hit you too hard with points about mixing and composition, because it seems to me this was purposely made short and simple just to get the style down. Overall it's a really good start and I hope to hear more in the future.