Keep on working!
~ Animation/Graphics ~
It's really not that bad, but major room for improvement. Looks like you have some natural talent so I have no doubt that you can improve.
First off I think you should work on the walking animation a bit more. Study some tutorials and practice animating walking.
I'd then work on your drawing abilities a little bit. Like I said not bad, but some room for improvement. The tree didn't look too great and the apples with it. The man could have used a face and the whole thing could have been just a bit more detailed. Again, with practice I'm sure you'll become better.
~ Story/Content ~
Not much here really. It wasn't too funny or unexpected. Perhaps instead of being able to see the hole on the screen you could make it so he falls when he walks off the end of the screen or maybe even a hole breaking open as he walks.
Then instead of not animating the fall you could make it so we see him fall. A huge fall, hitting things like branches and sharp rocks on the way down. When he finally hits the ground he's still barely alive. He notices the apple right next to him and goes to grab it. As soon as he does a rock falls on him crushing everything but his arm.
Just throwing out some ideas. :P
~ Audio ~
Not bad audio at all. I really don't think there was anything to improve audio wise.
~ Overall ~
Keep working because you have potential. I hope my review gave you some good ideas and good luck in future projects.