Gravitron

Gravitron is a bit like a combination of Gravitar, Scramble and Choplifter. The object is to rescue a prisoner at the end of a side scrolling level full of missiles that fly up at the player's ship. The ship must use its rockets to overcome gravity while navigating the level. The player can fire back with regular shots or with limited smart bombs. Once the prisoner at the end of the stage has been picked up, the player must navigate back to the base.