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As teamprivite said, you should finish your flash before submitting it. With that said, here's some things to improve on:
-Zoom the flash in. At first, I couldn't even see Mario or the fireball because it was so tiny.
-Make the framerate smoother. Unfortunately, I'm no expert at flash so I can't tell you how to go about doing that. But, you have to fix it, man. It looks incredibly cheap.
-Add some sounds. Aside from the music, there was no sound at all. And the music just loops which is quite annoying.
Perhaps you're already working on these issues and this flash is just a rough draft of sorts. But as it stands, I'm gonna have to give this flash a 0. That does not mean that you should give up the project altogether. It just means that you have to do some hard work to make something good of it. Best of luck.