Sigma Star Saga Game Boy Advance

This original GBA game is set in a grim distant future where humankind finds itself at odds with an invading alien race known as the Krill. Players take the role of a brave operative who works as a double agent, and thus gains a unique perspective on the ongoing conflict. The game's story line branches according to decisions made. The hero's weapon is customizable as well, as it can be upgraded with more than 50 collectable "Gun Data" powerups. The Sigma Star Saga plays out on six different planets and, in addition to the thirdperson exploration and shooting, players encounter classically styled sidescrolling shooter sequences as they travel from mission to mission. ~ T.J. Deci, All Game Guide