Makes me think about a bunch of robots getting stuck in traffic and then zooming away when there's room. :P
It's a little bit monotone-ish overall, but nothing severe. The song goes from the the minimalist parts to the higher intensity ones, with each using the same techno horns and beeps. This horn is usually at a high pitch, and is used frequently which is why the song might not sound as diverse as you'd like.
However, you do have different instruments that are lower pitched as well, so perhaps instead of having a long part of low intensity around the middle of the song, you could include a medium ranged piece that features the lesser used instruments as well as some new ones that get added to the composition. Would also add to the song variety. :P
Try dissecting this piece and I'm sure you'll find a way to improve. :)
Keep it up!