Too many things wrong with the gameplay...
...to warrant giving this a fighting chance.
Your aiming reticule is grossly inaccurate for many of the shots you need to take.
Even with the upgrades, the meteors come in groups much too large for one gun.
The gun froze often enough to wipe out half my city, and I don't miss easily.
When I did miss, I had to wait at least 2 seconds, which in this game is enough to wipe out half your city. You just need to take this back to formula, work on the actionscript parameters, and bring back something that doesn't feel like I'm playing Atari with a broken joystick.