Not bad.
Animation / Graphics - This looked like some sort of test to me, which would be my reasoning on why you didn't have any color added yet or a background. The animation and drawing were very well done though. I must compliment you on that.
Story - No story yet, but like I said it seemed to be more of a test to me then anything. If this was to be turned into a real flash movie with a story put behind it, it would probably have an amazing score.
Audio - It's good that you had music in the background. Maybe you could of had some robot sound effects when they walked or something, but pretty good here.
Overall, this has a lot of potential if you would do something with it.
C52