Hit both the Left and Right Flipper buttons at the same time while the ball is in the launcher and the ball will be shot up.
Video Trick
When you finally get to the part where they go "Today we will be attacking ..... Destroy Everything", hit the left and right flippers at the same time and the alien will kill him. Thier are four different killings.
View Credits
While the game is not in use, hit L, L, R, R, L, L, R, R (the left and right flippers) and the credits will appear on the screen.