Good Stuff
It's not often there's a satisfying short on NG. I found this funny in its random acts of violence. The fact that the rocks just come out of nowhere is what made me laugh out loud. I think the sound effects were spot on and the animation wasn't too shabby. The lack of holding lines made the artwork look pretty slick.
The walk cycle was off. When the left arm swings forward, the right leg is supposed to swing forward and vice versa. This had the left arm moving forward with the left leg and so on. Also, you don't need to have your copyright info up on the cartoon the whole time. It's distracting. The best place for it would be the screen where your play button is. If you feel you must have it up on the screen the whole time, place it at the bottom right of the screen where it's not such an eyesore.
Overall, I thought this was a great effort and worth watching a few times. You've got talent and a good head for comedy. Best of luck on your next project!