It's nice but...
It's to easy, all you do is smash the click button. The next time try making a time period of, saying, 12 frames if it's animated in 24 fps.
Also, add a few more frames to the tweens that make the chickens slide from one side of the screen to the other, if they're not tweens, maybe changing the "_y+ SPEED = X" actionscript may hrlp making the chickens move slower.
Anyways, I can see you did a preety solid actionscripting, no bugs wich is something strange in an "amature" level game, and the art was also nice.
OH, and try to add some animation to the chickens and to the balls the germ shoots!