terra cresta

in the follow-up to moon cresta, a well-guarded planet is being invaded. you will have to make a succession of passes over the landscape, shooting out ground turrets and aliens. numbered bases release power-ups when shot - these can either be used in combination or (by pressing the space bar) in formation mode, covering a wider range of shooting positions. each pass over the planet ends with a boss; the third and final one with a boss who can only be killed if you are at maximum power. death puts you back to the start of the world.