The Wandersong was essentially the Earthsong without the Dream King’s piece (and the people as well). But really, the whole point of the song was that the world didn’t have to be destroyed and recreated in the new universe. Without the Dream King’s piece, that represents creation, the world was not destroyed and remade!
Coincidentally, the word "Wander" has six letters, the same number of pieces of the Earthsong the Bard collected.
Why is Chaos represented by a droplet and the ocean? Well, life began in the ocean, which used to be a big mess of chemicals and proto-organisms. The ocean is also home to millions of species of marine life of all shapes and sizes, a chaotic mess of diversity.
On the song wheel, the yellow color for Dreams is pointing forward, while purple for The End of the World is opposite, pointing backwards. This could symbolize how Eya recreates the universe, by destroying everything (going backwards), and then making it anew (moving forwards).
You would think the symbol for Order would be a square. However, triangles are the most structurally stable 2D shape. What better to represent Order than a shape harder to collapse or break down?
It also makes more sense since the game features a 2D construction-paper art style.
The Overseer of Chaos is found within an archipelago surrounded by the ocean, while the Overseer of Order resides near snowy Chismest. It draws a comparison between water and ice; water as formless and fluid, and ice being rigid and structured.
Talking to the Wind fairy reveals that Winds symbolizes freedom and direction, a nod at how the Bard later frees the cave troll's boyfriend from their curse.
This even ties into the song they sing when lifting the cave troll's curse; "I Wanna be a Hero" is their song about wanting to prove to everyone that they were wrong about them, as in break free from others' expectations and show those people what they can do.
A star is the symbol for Dreams, the one that represents creation and believing. This could refer to many things:
Dreams and wishes are often associated with stars, both through association with nighttime and the traidition of wishing upon shooting stars.
Stars are some of the first things that formed as a result of the Big Bang (notably the atoms and subatomic particles that form stars). They were big fusion engines that resulted in the creation of heavier elements, planets, and eventually life itself.
This also explains why the Dream King became lazy, nihilistic, and apathetic; the opposite of being creative and believing in others (as explained here). He even describes the End as everything and everyone moving away from each other and growing distant, like how the universe expanded from a single point. This is one theory of how the universe could end; everything moving away from everything else, becoming so distant to be practically nothing.
Both the Sun Overseer and Moon Overseer's songs have to be played at the same time in order for them to work. As a result, they overlap, just like the eclipse behind the Bard and Miriam.
Audrey's sword, granted by Eya, shoots lightning. It was given in order to enact her judgement of the universe, being to accelerate its destruction.
In Act 3, when Calliope tries a divination on the Bard to see if they're really "the hero foretold", she doesn't see anything at all. The straightforward answer to this is that the Bard is Immune to Fate, but another possibility is that she saw nothing because of the impending end of the world. It wasn't that she couldn't tell the Bard's fate, it was that she did see the world's fate...and it was oblivion.
). He even describes the End as everything and everyone moving away from each other and growing distant, like how the universe expanded from a single point. This is one theory of how the universe could end; everything moving away from everything else, becoming so distant to be practically nothing.