Don't really have much constructive critisism to give.
The intro works great, personally I think I kind of hate that kind of snare, I think they just overpower everything else..
And most of the action seems to be going on in the midrange.
Tl;dr version: Moar drum and bass, less snare and mid.
On the brihgter side I think the intro works really well, the siren sound gets a bit repeptitive the second time around though, could do with some messing about of sorts...