March of the Robots Not too shabby.
I would say just work on a couple things.
For one, try to keep the pace up. A couple of the scenes at the beginning when all the robots were marching, it kind of hung there showing them without anything happening.
Also, work on keeping their legs moving in motion with the floor. It looks like they're walking slower than the floor is moving below them.
Last, a few of the animations looked kind of jerky, seems like you used only a handful of frames and lots of Tweening. This is fast and efficient, but doesn't produce a good effect in terms of realistic movement.
These are all minor issues, I thought it was pretty good flash.