This galaxy is unlocked through feeding the Hungry Luma outside of the Kitchen Dome. The Hungry Luma will spawn once you complete the level Sunken Treasure in the Beach Bowl Galaxy. You’ll need to feed it 600 Star Bits to make it transform. There is only one level in this galaxy.
During this level, you’ll only have access to one planet as it is an underwater level. Your goal is to defeat the three Giant Eels so the Penguins can fish again.
Giant Eels - The Giant Eels will not chase you, but if you’re caught in their path they will either bite you or slap you with their tails. You’ll need to use shell to defeat them in this level.
Torpedo Teds - Torpedo Teds are basically underwater Bullet Bills. They will chase after you like homing missiles and try to hit you. You can guide them into structures to destory them though.
Urchins - The Urchins are spiky sea creatures that will damage you if you touch them. You can’t defeat them by jumping on them or spin attacking them. You’ll need to either use a shell, guide a Torpedo Ted into them or use a Rainbow Star if you have access to one.
Spiny Cheep-Cheeps - The Spiny Cheep-Cheeps in this level will pop out of some of the chests when you destroy them with shells or Torpedo Teds. They will chase you, so you’ll need to swim away from them or get damaged by their spikes!