Needs fleshing out
This piece is an assembly of some excellent musical ideas that are all under-developed and awkwardly combined. It reminds me of the NG "collaborative" flash animations, where some stuff is too short to be interesting, and the differences in style but similar theme just throw you off.
You've got two awkward transitions at 0:45 and 1:39 that used a slower drum beat; those parts should last longer because they sounded like cool ideas. And 1:45-2:25 doesn't fit; it's empty so it has no energy, but it's too noisy to be the "quiet part". Either beef it up, or reduce the instrumentation.
Finally, why the one major chord in the last segment? Switching from minor to major is cool, but that's not what you did - you changed *one chord*. It's jarring.
Globally, the separate sections should be more different from each other to give contrast, or more similar to each other to make the song cohesive. I know you put a lot of effort into the instrumentation, but just a little more effort into the music would have made a bigger difference.