Sigma Star Saga's shooter game mode uses a classic feeling side-scrolling style where you zip through the level shooting everything that moves. This style reminded me of older games like the classic R-Type series. When not in your ship, Sigma Star uses large, highly detailed and anime-styled characters in an isometric universe of corridors and tunnels. As you progress through the game and meet new people, it is easy to notice differences between the main characters because of the amount of detail that went into each model. These differences range from the color and styles of the alien uniforms to the character's gender and even noticeable differences in their weight. Though the game uses a classic tried-and-true perspective, the characters and worlds are large enough to use all of the GBA's 2D rendering power.
The musical score and sound effects also help to bring this game to life. While roaming around the world away from your alien space craft, the subdued music helps you to concentrate on whatever quest or goals you happen to be taking part of. When you are beamed aboard your ship, however, the music ramps up and gets your heart racing as you dodge enemy fire and larger ships. The various weapons' fire and other sound effects also keep your ears busy and fit the game's style very well.