Help Sgt. Johnson to survive in outer space through 15 levels with 15 different enemies and three bosses!
| E: | Activate Turret Shields (if Upgraded) | |
| Left Mouse Button: | Spawn Asteroid | |
| M: | Mute | |
| P: | Pause | |
| Q: | Spawn Turret (if Upgraded) | |
| R: | Remove All Asteroids | |
| W: | Activate Shield (if Upgraded) | |
| Fire: |  | Left Mouse |
| Movement: |  | Mouse |