Space
   ...Invaders...

Keys To Use:
S to START
Arrow up or space - Fire 
Arrow down or M - Fire a missile 
P - Pause on/off 
S - Start the game 
Left arrow - Move spaceship to the left 
Right arrow - Move spaceship to the right 
Escape - End the game currently playing 

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Instructions/rules 
If the attacking spaceships comes all the way down to your spaceship you lose two lifes. 
Bonus lifes every 10000 points. 
When the UFO passes - try to hit it, when you do you gain 1000 points and a new missile. 
500 points for completing each level. 
The attacking spaceships may have one more bullet on the screen for each level, the game also moves faster. 
You may have 6 bullets on the screen at any time (and only one missile)