Invader

Invader Sammie's spaceship was shot down over an alien world.
 * Game website

Walkthrough
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.

Section 4
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.

Secret
In Laser Mode, you can get bast the blocks directly. Doing so allows you to reach a hidden room, but he disappears if you try breaking open the walls.