You're Asteroid Janitor O-714, and your job is to keep Earth from becoming a fiery hellscape. You'll be fine.

Separate your ship to reveal your laser and vaporize oncoming space junk. You can stretch your laser to the limits to knock off multiple asteroids, but be careful — if the laser durability hits 0, you won't be able to destroy anything. (Besides Earth. Inadvertently.)

Bring the ship back together to repair the laser as often as possible, and you'll keep everyone on earth safe and alive! For now!