Zoar

Zoar is a top view vertical shooter where the screen scrolls upwards
constantly over various stages. Your aim is to fly over the surface of a
planet and blast and bomb various enemy crafts and ground targets. While you
blast and bomb, the enemy will fire their weapons back at you trying to
destroy you and if you are hit then you lose one of three lives. After
surviving a stage you can touch an air strip to collect bonus points. Two
players can play and each player takes it in turns to play when the other
player has been killed.