Basically, in this game all you do is battle bosses. Each time you beat one another one comes, but parts get added to it. You can customize the way you play in the options menu with time, infinite lide and more! The more you die, the more time is reduced. If you beat a boss, time is added. You can also rotate your ship around by pressing a, s, or d, I couldn't remember which one it was before I changed it. You'll reconize it because a green shot guider will appear.