MAINBOSSES
EnergyTemple Boss:
Shoot him with energy blasts until he backs up. Use the bind song to grab the pearl at his feet and place it in the statue to the east. Then when he gets close enough hit the pearl and turn on the laser. After a while he won't openly walk into the laser, so lure him close by swimming past the laser line and enticing him into the laser's area with your energy burst ready, then hit the pearl when he's close enough.
Mithadra(?):
Wait until he walks to the left and spits out a little zombie merman. When that happens lure the zombie merman by the green gas (warning, Mithadra can grab you if you're by the green gas hole too long. Use energy form to make him let go.) When the zombie merman passes the green gas he'll turn into a bloated zombie merman. Bind him, and while he's still binded go into energy form and his Mithadra until he backs up past the shaft of light. Then go back into normal form, unbind the bloated zombie in the middle of the area and dash to the bottom of the screen to hold unto the ground and not get sucked up into Mithadra's mouth. Repeat until his eyes explode (WTF?!) and everything starts going all red-epilepsy. Then blast him till he stops moving.
SunTemple Worm Thing:
Go into energy form and eat a lot of speed soup so he doesn't catch you, then make circles around him and shoot him. Also apparently you can hang off to the left side of the screen and shoot him with energy bolts and he won't touch you.
KelpForest Boss:
Dodge the enemies and wait until she starts singing. Copy her note and then go into energy form and spam energy blasts. Wash, rinse, repeat.
SunkenCity Boss:
Go into beast form and eat the pink jellyfish when they appear. Then use that ammo to blast the singing wraith when you have a chance. While she's knocked out you can shoot the big hulking sea frankenstein thing. After a while the wraith will die and you can blast the frankenstein until he stops moving.
Final Boss Form 1:
Shoot his head and dodge his attacks until he changes.
Final Boss Form 2:
Shoot his upper body and dodge his attacks until he runs away.
Final Boss Form 3:
Chase after him, go into the room with lots of tunnels and use the sun form to uncover his location, then shoot him in the eye, dodging his swipes. Eventually he will run into the room to the southeast. Enter here and keep your distance while shooting his eye and dodging his lunges. Eventually he transforms again.
Final Boss Form 4:
Copy his notes and the laser bubbles will disappear. Copy his notes enough times and he'll fall.
Final Boss Form 5:
Shoot his braincase at the top left of his head and reveal his eye. Shoot the muscle off of the eye until it dulls and becomes invulnerable, then remove the eye with the bind spell. Next go down to his stomach and use the dual form Li to shoot his mouth for a second (then get out of the way of the laser.) After a while enemies will spawn. Kill them and absorb their power. When Li is charged up turn into dual form Naija and make an energy blast near the stomach. Repeat this 4-5 times while avoiding giant colorful balls of death and stuff. Enjoy the ending.
MINIBOSSES
Nautilus Prime:
Move around her until you can shoot her head, and do so. Also avoid tiny nautilus enemies.
Octopus Prime(?):
Get close to it's mouth and a pearl will appear. Shoot it then move out of the way of the tentacle. Shoot any squids that spawn, and use the Sun form to get rid of the darkness.
Frog King Prime(?):
Just move out of his way and shoot him when he comes bouncing by.
Energy Crabs(?):
Dodge their attacks and shoot them to death.
Arnassi Crab:
Use the nature form to give him a thorny-enema.
Jellyfish of Death:
Spin around him, avoiding lasers and shoot the hole in his eye. Use the beast form to clear away those annoying jellies.
Frozen Veil Crab:
Wait till he's about to spit out bombs, bind one, then use the nature form to jump out of the bubble and shoot the area under his legs. Unbind the bomb close to his head and swim away from there. It'll go off and he'll take damage. Repeat several times for best results.
Mithalan Priests:
Wait until they go out of ghost form and shoot the crap outta them.