Needs a deeper Story
This just wasn't that funny and I didn't like how the story had no real plot at all. Improve on making more settings and backgrounds for the Ninja panda instead of that bamboo field. The art could use some work as well (the crab has one largerclaw than the other, WTF?).
If you want to make an action movie, have the panda have more attack moves. If you want it to be funny, improve on the dance a little more with some other characters.