I played it for 30 minutes. A boring hell! Its whole HUD is a health bar... No controls for elevation! You just move back & forth shooting the endless enemy drones until you see they explode or your health bar depletes to start the level over again. And that's all the fun you get. The repetitive background music gets boring fast. A waste of 6 Gigabytes and my time. Totally unhappy with this game received for free.