Not bad, not bad.
You did pretty well. Here's the break down:
1. Intro: I dig the intro, was thinking that this would be a very calm song... but then you transitioned pretty quickly into that 160-170 bpm drum and bass beat... something I didn't like at all =/ Then after that speed up, you slowed it down afterwards after 2 mins or so of listening to that upbeat part... minus points for that =/
2. Sounds okay so far, but I think the beats could be much tougher. Punchier snare, and a much harder kick would be better.
3. One thing I noticed about the beat... it's not the usual drum and bass beat. The 'bum..pish, bum-pish'. It's fine, but you should have probably started with that.
4. After hearing it about three of four times, it gets a bit annoying. The synth especially, that main melody. Don't like it at all. But that's just me. To each his own.
5. Outro: that was a cool outro. Nice fade out.
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Overview
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Well, the song over all is pretty good. You need to work on your transitions. They feel a bit odd and awkward, especially when you're trying to speed up a song that starts of calmly like that, and that slow.
Beat-wise, it was pretty good. You could have done the beats a bit more justice by making them much tougher. They seem too blunt for this particular song.
Synths: they sound too annoying... I kinda cringe after hearing it a few times. Too high in pitch. Work on that.
Everything else is pretty good. You set up a good foundation in the beginning, but the problem was that you sped it up too quickly and too abruptly. I think it was meant to calm and slow. But that's just me. Either way, you did pretty well, and I congradulate you on that. Good job. Keep it real~
~[IZK]