Another slide-and-shoot game.
It probably was Centipede that introduced the insect theme to shoot'em ups. There are some resemblances to Space Invaders, the enemy moved lower and lower until it reached your level, but this time it was not the space alien, but an ordinary centipede. There were also other unpleasant creatures, like spiders or scorpions.
The player movement is enhanced, so the up and down keys are now useful, it lets you to avoid the collision when the enemy is on the bottom of the screen. As other bugs came down the screen, the player could shoot them through a thicket of mushrooms. More mushrooms would appear behind the bugs, and by the metamorphosis of shot centipede segments.
There is a sequel called Millipede, a bit enhanced version.
fig. 1. Centipede
fig. 2. Champ Centipede
