From the beginning pick-up the Bounce Ammo from the blue box. The Bounce Ammo is as strong as the Standard Ammo so unless you really want to use it, it's best to hold onto it until the end where it can be put to good use.
The Mobile Launcher at the beginning of the level should be no problem, just hit it at a good distance and try to destroy it before it shoots at you. If it does shoot at you, strafe to the side so that it's missile hits the wall. Pick-up the two gems on the lower course before going up the ramp. Get the gem past the elevator, and then take the elevator to the top.
Strafe as soon as the elevator reaches the top or you will be shot by the Gun Turret. The electric barriers are quicker on this level so try to time them right. The next room is a big open space. If the Spinner is there aim your shots well to take it out. Sometimes the Spinner is at the beginning near the elevator, it just depends on how it moves.
Use this room to shoot at the two Gun Turrets in the next room from a distance so that they do not shoot back at you. Don't stay in one place for too long or you will be hit with a bomb from a Bomber or from the shrapnel from a bomb that hit the ground. Once the two Gun Turrets are destroyed move into the next room and take out the Bomber.
Push straight into one of the push block to revels the ramp that leads downward. At the bottom
equip your Bounce Ammo and shoot around the corners to hit the Gun Turrets and Missile Turrets.
If you run out of Bounce Ammo use can use regular ammo, just strafe back and forth from behind
walls to hit the turrets.
If you hit it right, you will land on the upper wall of the arena. From here you can drive to the exit block, drop down and hit the remaining turrets from the side, where they won't see you. Either drive back to the exit block after you get all the gems or go back up to where the Gun Turrets and Bomber are and get back up on the upper wall. Be careful because the Gun Turrets and the Bomber will regenerate after a while and will probably be back up there.