Mother Pheonix is an Atomic Phoenix, and is the boss for the Jungle Planet. She is the mother of the Atomic Phoenix hatchlings. You must use the Laser Lance to defeat her.
To get to her, you must fly on the unicorn and dodge various obstacles, including robot bees, storm clouds and bird missiles. When you get to her, you must charge up your Laser Lance by holding down the mouse and then releasing it. You must do this three times in order to kill her. At any point of time, she can launch bird-like missiles which you must dodge. You also have to dodge her when she flies toward you. She may also pop out on the opposite side of the screen at some points of time. You cannot harm her during these times. After blasting her thrice, she will fall apart.