Fast-paced combat: Take down swarms of aliens with quick reflexes and calculated precision. Chain kills into streaks to earn extra points.
Story: Fully voiced 3D cutscenes.
Music: A symphonic score for the intro and ending, and aggresive synths in-gameplay.
Two endings: Earn 20,000 points or more (or complete the game in Ace difficulty) and unlock the secret ending.
Enemies: Diverse alien species, each with unique flight patterns, attacks, and behaviors.
Boss battles: Test your mettle against powerful alien bosses that demand your best dodging.
Difficulty: Three modes that adapt the challenge for every player, from story focused to pure suffering.
Fun achievements: Unlock them by exploiting enemy mechanics.

Unlock the alternative ending.

Complete the game without using a single secondary weapon.

Complete the game without missing a single bullet.

Obtain 5000+ points on Skywards.

Obtain 5000+ points on Dustfall.

Obtain 5000+ points on Ironclad.

Obtain 5000+ points on Adrift.

Defeat the giant Stinger in less than a minute.

Defeat the giant Pulsar in less than a minute.

Defeat the giant Bomber in less than a minute.

Do not get damaged by any of the final boss' attacks.

Kill a Watcher using the falling body of another Watcher.