Funny, but lacking. . .
This is your only submission on Newgrounds, so you're doing very well for an up-and-coming artist. Keep it up! The animation was alright. You did a fine job of moving the figures across the screen fluidly, and not taking any crappy shortcuts. There is very clear effort in this. In terms of direction of the animation itself, try downloading the Flash "Vcam" (google it) and use that to make the whole thing more visually interesting. Also, work on your background art a little. Work with linear and gradient filling for skies and flat surfaces.
The audio was a decent effort; you picked a good song. Use some sound effects next time (make them quieter than the song, of course) to make the whole thing more audibly exciting. Other than that, you did a good job. Maybe sync the animation and the audio?
The idea itself was funny, but not that intriguing. "A big cliff where are stick figures go to die. . ." could be really hilarious, had you added more plot and back-story. It's clear to me, though, that your still finding your way around flash, and learning how to project all of the images in your head onto the screen. I can relate to this, so just keep working!
It was a good effort, and I enjoyed it alright. Maybe try to direct it a little better, and add some sound effects. Start writing in plot-lines and such, and you'll be on your way to greatness. I voted three on this submission, to raise the score; I'm nice.