This is a great animation. It very efficiently delivers your message and it makes a very strong social statement about our way of life.
There is a lot of dynamism in the animation. I like how most of the movement is at the front where you want it, but you still have tiny bits of moving parts in the background. The background is moving in the just the right amount not to be overwhelming.
In addition to the general motion of the conveyor (the parts moving forward, up and down), you added another dimension of movement by zooming in and out. It makes it feel like we are part of the action too. We are getting closer to get a better view.
This is a very complex animation, it has a lot of small details but yet you managed to keep it simple and uncluttered. This is due to the black and white scheme, the uncluttered background and mostly to the illustrative style which is perfect, detailed yet simple.
I really cannot find any ways in which you could improve this animation. Maybe by adding music to it.