The darkness represents a halt in progression and a sort of blindness of the world.
Summary: The male who came from the deep darkness of the caverns and the female who came from the darkness of the moonless night, who, together gave birth to the life forms of the sea.
From the sea forms came the birth of coral, urchins, eels, etc. From this generated a chain of birth, which gave the world its form. From the sea grass came land grass, then trees, and then animals.
The sun is a representation of birth and progression.
This generated chain turned into the beautiful light that is the day that then spread across the world with the birth of humans who then expanded
This creation story really represents the Hawaiians deep thoughtfulness towards how the world works. They take deep respect in progression and the beauty in which it entails. The story is the culture's own interpretation of how thoughtfully it flows together.
Sunlight slightly brightening the sky
Light continued to get brighter and brighter with each creation
Finally, with the birth of the humans (Ki'i, La'ila'i, and the god, Kane) and their expansion, day spread across the world.