Hells Jea, Cake rocks!
That was very good i think, I like your drawing style.
Only thing was sometimes if you click too many times (such as when many enemies are falling around you) the gun stopped working, which annoyed me slightly.
Another good thing was that it wasn't too hard, just when I thought it was getting really hard, and i would lose on the next level, it ended, which i think is good; I don't like games which are needlessly too hard.
Also, I was just thinking about making a Flash to the song Comfort Eagle by Cake today, and there it is in the credits of your game! Creepy.