The art style is so cool it already makes you smile before anything funny happens. The camera movement is also something great.
Two things I dislike slightly:
1. When Ultron says "there are no strings on me" I would have loved it if his mouth actually moved. Because it's not really creating the impression that he is saying it. It sounds more like someone off-screen is saying those words.
2. Around 30 seconds Thors beard magically seems to get bigger and smaller, when he gets to the closed-mouth-piece. I don't know how that happened.
But all in all, this video quite clearly shows you are talented. :)