Reeks of unoriginality.
The short story is, sprite animations have been done to death. Very few bring anything unique to the table, and this is no exception.
Nothing new was on display, as this story has been done before. Unless you're really going to go out and make it unique, I wouldn't bother doing anything of the sort.
There's little I can say about the art or animation, as the art was pre-made sprites and a single image (the mock up title screen, which I'll admit looked alright)
Start making animations using your own art and universe. Hell, you could even draw Mario and Luigi in flash and you'd at least be a step ahead of most sprite animators.
Better luck with your future submissions,
battosai810