Invader Sammie's spaceship was shot down over an alien world.
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There are five major sections within the game, not counting the central route. In the first four, you have the option of taking two different paths, which eventually converge.
The first branch allows you to go either up or right. In this case, take the path directly leading right until the corridor splits into three.
The lower path has four spawners, the top path ahs four shooters, and the center path has three turrets within the path. After going through this area, head ddown to continue.