Get a plasma gun (H) and save it for the second miniboss in the second level. Go to the right side of the screen, charge up your plasma gun, duck and fire towards the alligators to kill all of them. While you are doing this, fire the gun horizontally at all bombs the helicopter drops to increase your combo, and fire vertically when a bomb falls overhead. Avoid shooting the helicopter. You should be able to get a combo of 60 and around 50 million CP before the combo meter stops and you start earning negative points. When this happens, you can commit suicide, restart the level and do the process again.