In Crashing Skies, you have to protect your ship from the bombs that are coming.
You can place and improve your guns, and you can also use your own turret to take out the bombs. You can switch between auto and manual to control your guns while the gun keeps firing. Or, you can use "control mode" to fire it yourself, which will make it more accurate and do more damage. Don't let those bombs get to your ship!
Have fun and good luck!