Can be much better!
Gfx - The characters look stiff and are very badly animated. Also, the framerate is pretty low, and the enviroment lacks details.
Style - A bit pointless, but there is a small potential in it. It seems you haven't really thought what you were making, you just made it. Try harder on the basic idea next time.
Sound - The music is alright I guess, but the recorded sounds were bad, and your microphone isn't really good, is it?
Violence - The only violent thing here is the alien spitting out a dead alien. Which is a bit stupid, but funny, and a tiny bit violent.
Humor - Nothing specialy funny here, only the monkey when he runs away from the small planet. Not much of a humoristic flash, but I guess I can give it a 4.
Overall - You need to spend more time thinking what you realy want the flash to be, and you have to animate the characters MUCH MUCH better. The way that characters move and talk, is just annoying and stupid. Better luck next time!