Use turret gun using "E", get up close and hold the key down,
Blast those roids.
Blast away looking up at the central point of the gun. twirling in that central motion.
i.e. look for the Asteroids dropping on your head. The farest top point.
Fire below the targets to get hits all the time.
Drop as many roids as you can..
The roids do die after while just shoot as many as think possible in a short period of time.
then, run in left to right or right to left picking off with your mine gun
watch your health not your oxygen. reload is auto if out of amo seek upgrade/ammo hit as many as you can afford.
Use "B" for your contructions of your base, Also use this to see how much of one ore or ores you lack, and grab the ones you need to get that part of oyur base built.
Use spacebar for jump.
when using shift for fast run once you are close to the base's blue wavy doors, hold down spacebar to jump a little higher... let go just above the top ledge of the door and drop in.
Get a vehicle with cash you sell some ores with plus ammo etc,
You must get the vehicles platform base using "b" to build it & then you'll have the vehicle availble for use once you ask for it when on the platform. "E"