Got song
... But in the wrong genre. For this song to be drum and bass it should be placed at 180 bpm. I'd call this hiphop or ambient.
The FX made it very interesting and created a certain dark city ambience. The bass, which I think is selfmade, grinds nicely. The sub stands out clearly. Its good to make the percussion vary during the song, it keeps it from getting boring.
I feel its lacking some melody. Altho its possible you inteded it that way. Scince I know your other tracks and they don't lack melody.
Overall it's not a bad track, to bad it's placed in the wrong genre. Mastered well, but could use some melody to go with it.
Greetz Duba
4'd