Ah ha...
Your first sprite movie eh? Well just keep in mind that its generally not a good idea to submit movies this short without thinking about what you're doing. I think people let it slip into the portal because its your first, and is obviously not some weirdo's fucked up spam movie. Although I have to admit, my first sprite movie was quite short, but I have learned a lot since then, so take my advice.
Don't just start working on something and then go "Oh I'm lazy I'll just submit the ten seconds I made." You should complete your movie, make use of all the ideas you have and apply them. Also try a higher FPS and less choppy animation. It helps. You'll go much farther this way, trust me.
Good luck, rookie sprite animator.