This classic arcade title starts with you in your space ship shooting at a killer centipede coming down the screen. Along the way you have mushrooms that will redirect the centipede down the screen (as a wall) and can be used to protect you from the centipede from touching you.
Along with the centipede other bugs appear on the screen of which you need to shoot. As the levels are completed the speed changes and the screen gets harder and more challenging.
This game was so popular they would come out with a very similar game a few years later called Millipede which works off the same idea.