I can see why it is one of your all-time favourites :O The ambience to begin with is sinister and sets the pace for the rest of the piece, impressive for a series of first tries.

I'd probably go with a slightly more distant lead to begin with, bringing it in more as it progresses -- but that's just a nitpick at this point.

The breakbeat is delicious. I am getting quite the Metroid vibe from this. I guess from here on out, it's up to you whether you want to keep it as is, or make it lusher, or expand on it -- what you have here, however, is fittingly dark and gritty, and reminds me of a dystopian place.