I think this is the father of all games ! (the mother is "Pong")
But I think you have be a bit older and computer-freakier to love and to know how to appreciate this game. When you startet with "Pong" and loved it 30 years ago then "Space Invaders" is THE game.
But if your first game was Spliter Cell on a Playstation you probably can't even get a hint of what this game was and IS.
I love it! And I always have to think of "Aqua Teen Hunger Force" with the Space Invaders episode. Space-Invaders-Alien-Quote: "Yeah funny. I love your third dimension."
cheers,
swiss