The random test thing is alright, but it's still nice to see some sort of background. That being said, I can get over that because they are simply tests.
The animation is way too fast... it basically takes away from any enjoyment of being able to watch this. The animation is good otherwise.
Because of the length of the submission the loop was alright, but I highly recommend waiting until you have a few more tests, add a play/replay button, and then submit something like this. It was way too short, but I'm assuming how fast the animation was had something to do with that.