It is a pretty good flash animation in my opinion. Although there's something most people don't get is the stuff that's posted up on NG doesn't just take several seconds (other then spam obvious)... Animations, even the worst of them (EXCLUDING spams >:P ) still takes hours to make and the most epic of NG stuff can take up to a YEAR.
And considering, the graphics here are smooth. There's nothing wrong with that. The sounds are primitive, BUT THAT DOESN'T CHANGE ANYTHING. Primitiveness can make a flash even more entertaining to watch and in fact, in some cases, it's actually a rather ingenious film technique (in this case, 'ingenious' would be a slight exaggeration -__- )
I have no dislike for the music. The first one was a rather overused theme (it's everywhere by everyone XD HA HA! I think I'm funny don't I! >:P) but the idea of using dubstep in the rampaging scene was a nice move. It fits well so well done.
As KAOSKING pointed out, the plot was rather simple:
1. Toy robot transforms to Killer robot
2. Killer Robot rampages
3. Killer Robot goes back to Toy robot
And simple again, does not mean awful (more like 'different' if you want to be pesimistic :P). Being simple can be ingenious in some cases, and in this case, it is.