This is the second chapter of Chicken Invaders: Ultimate Omelette. The boss is the Space Crab (4 catapults). After beating it, you saw the Space Crab, dead and defeated. And Hen Solo says the cannon will possibly take two different routes, Hen Solo covering one, you cover another. Hen Solo will stick to you in this chapter.
I recorded my gameplay using Fraps at 75 FPS. Vsync (vertical sync) was enabled in the options on Chicken Invaders.