not bad
decent for your 3rd movie, but excruciatingly short. nothing happened except for a 2D run and a very brief impact.
you should probalby either submit things with a bit more substance, or practice yourself until you're confidant enough to submit something a bit more complex.
start small and work up, but do that yourself. once you've conquered the basics and are able to produce something 20 seconds long or so with a bit more technical animation, then submit it here. i know that it's hard to get feedback this way, but it will save you from getting blammed which is a hit to your confidence ;p.
what was there was good... but there just wasn't much and was simple.