One of the biggest flaws of this is that it goes on way too long. It would have been a lot more enjoyable if there had been some actual sound in it too. This seems way too much like a test, which is something generally frowned upon again. The only thing I liked was how you could pause it. It was just unpleasant to see all those black lines everywhere. This would have worked a lot better if it was a tutorial or something. Mostly everything is white space with some poorly done colors.
I'm sorry I didn't like this, but at least it is your first flash. I suggest having a background and having a lot more movement going on. It seems like it's just a bunch of still frames over and over. It needs to be of much higher quality for something that goes on this long. At least you seem to have knowledge of "Dragonball Z".