the game takes place on
a screen that is 700 high by 500 wide. You control a spaceship (the ship) that sits at the bottom
of the screen. You can only move the ship left and right by dragging the mouse left and right.
It should always stay at the bottom of the screen however. Above the ship is an array of alien
spaceships (the aliens). The aliens drop bombs down at random. If the ship is hit by a bomb, then
you lose the game. The aliens move as a block in a zig-zag motion from top to bottom. If any
alien reaches the bottom of the screen then you lose. Your ship can re missiles up at the aliens
by clicking the left mouse button. As soon as the missile hits an alien ship, the alien ship and the
missile are both destroyed. When all aliens are destroyed you win. There is no scoring or limit on
number of missiles that can be red.