I really liked it :)
Cute and simple. Couldn't have taken too much time to make, meaning that you can continue this as a series easily :D Which I hope you do, because I enjoyed it.
I do think that perhaps you should have used the line tool in drawing the robots, keep their style the same as teh background. But it's fine either way :P
Finally, what program did you use for the voices though?
Good work, keep it up.