Get a plasma gun (H) and save it until the second mini-Boss. Go to the right side, charge the plasma gun, then crouch and fire towards the alligators and kill all of them. While doing this, shoot the gun horizontally at all bombs tat the helicopter drops to increase your combo. Fire vertically when a bomb falls overhead. Do not shoot the helicopter. You can build a 60 combo and get about 50 million CP before the combo meter stops. When you start earning negative points, intentionally lose your life, restart the level, and repeat the process.