intro sounds good, i think the bit with the half time beat needs a bit more funk to it though. maybe try adding in some off beat kicks/toms, or even reverse kicks/snares and general swooshing sounds can make a beat like that come to life.
i think the main section is pretty good but it kinda comes a bit out of nowhere if you know what i mean? like the bit at 3:15 is fine because the point is it kinda comes out of nowhere. but the half-arsed build up at like 1:50 doesn't really add anything at all.. if you're going to have a build up like that then i think you need more textures building up as opposed to just the kick of the break. an easy way to do that is to get some white noise, put a low pass filter with really high resonance on it and then slowly open the cut off as the drop approaches. and i'd say a little snare roll or fill of some kind just before the drop would work nicely. but just experiment and play around with it, listen to whatever inspires you for ideas!