To avoid damage at the part in The Menhir Hills where there are vines blocking you from crossing and rockets are flying at you, do not blast them with your fists. Continue to spin in a circle and the rockets will become dizzy and stop attacking you. Jump onto the rocket and cross the vines.
Start a new game and take you out of the Buccaneer. Get to the place with a large hole and a cage, but don't break the cage. Instead, kill yourself by jumping down the big hole until you die. The level will restart, but now there's something more here. Remember where you first met Murfy? Go to that place.
Use your shield to deflects the blue orb attack. However, when he uses the pink orb attack, shoot the orb to turn it blue, deflect it, then shoot it again to turn it pink again. This is the toughest part. When he fires the golden orb attack, grab on to the UFO and reel him in until the orb is quite close. Then, shoot the orb to blast him back. Repeat this about four times to destroy him.