You've done well, but needs alot of improvement
First of all, I thought it was pretty well animated. The sound was good too, you timed it well. But now I have advice for you that you should take into consideration:
1. You need to make more sense of the story. A plane crashes into the right side of the screen and Mario and Luigi find Peach dead on the left side. You need to make alot more sense of this.
2. Don't mix sprites. I hate it when people mix the sprites from all different games. Some are 16-bit, some are 8 and some are 32. I very highly recommend that in the future, don't mix sprites. Have ALL the sprites from the same game.
3. Have more action! We want to see more than just kicking turtle shells at things.
Well, I hope my advice helps. Keep it up.