The idea of this game is to save our spaceship and destroy the invaders.
There are multiple levels in this game. Once you finish one level, you will
move to another. As you level up, you will start to understand that the game
is difficult and impossible to pass on the first try. With each level, the
invaders get faster and drop more bombs! Hence, you have to be careful.
Controls: Move spaceship with arrow keys. Right arrow (-->) to move
right and left arrow key (<--) to move left. Press Spacebar to fire on