Silkworm

Silkworm is a classic, horizontally scrolling shoot-em-up. The main difference between this game and many other side-scrolling shoot-em-ups is that you'll be both on land and in the air. The first player takes the role of a helicopter, but when a second player joins, he takes the role of a jeep. Both players have to protect each other as well as themselves. After a certain number of kills, a "goose" helicopter appears on the screen. If players manage to destroy it, they receive a powerup for their weapon. This continued throughout the game, and a "goose" could even appear during the fight with the bad guy at the end of the level.