I read the first chapter, and here's what I noticed:
Third person omniscient has fallen out of favor in the last forty years or so. For two reasons in particular: it is distancing to the reader, and it is difficult to do well. Both of those are affecting your story.
As for distance, we get literally no interior view into any character. Not even a name at first, much less a thought, problem solving, emotion, or sense of stakes. It is like watching two mannequins standing next to each other with a narrator explaining what we are seeing. Does the brave hero have a mind? Does he have feelings? Vulnerabilities, personal tastes, or problems to solve? (In other words, things that compel the reader.)
Even LOTR, which is third person omniscient throughout, goes into tight focus on a specific character at any given time. We understand it is Gollum's or Sam's or Pippin's perspective, and there are enough internal cues to keep us tuned in. Who is the perspective of your first chapter from? The default of 3PO, which is the air (aka unbiased narrator) who has no emotions, struggles, or social commentary.
This chapter is extremely distancing. As distancing as it is possible to be, really. I suggest pulling the camera as close into one character's POV as possible, or even rewrite it as third person limited to allow us access to their interior brainspace.
The second problem with 3PO is you can step into a lot of writing traps. Without a character anchor, the author/narrator has to work doubly hard to make anything meaningful. This chapter is working quarter-time at best.
It has a case of white room syndrome, for starters. Where are they? "The center of Creation, the birthplace of all universes." What is that? A planet? a black hole? an abandoned factory in Brooklyn? The third moon of Tantive IV? A pool of primordial goo? A giant marshmallow? There are literally zero details about setting. So, technically speaking, all we know is the characters are floating in a white void, like the construct in The Matrix. I'd give my left nut for any, I mean any, scene setting. You say "On one side stood a small figure." On one side of what? In my mind the center of creation is a massive plasma reaction somewhere in deep space that has been expanding for 13.787±0.020 billion years. There is nowhere to stand there. Or breathe. Also, a human would either be frozen solid or fried to a crisp (we're not really sure.)
Then there's the telling instead of showing. For example, brave hero. That's like sticking a name tag on your characters: "who are you?" (looks at name tag) "Oh nice to meet you, brave hero. I am evil villain."
How is the unnamed human figure a hero? why are they brave? Show us.
Also this: "A resounding round of rebukes from various directions began."
Various directions? Like, up, down, and diagonally to the left? Resounding? from where? voices? thunder? speakers in a Chuck E Cheese pizza parlor? from whom? Lizard people? mosquitoes? Lovecraftian tentacle beasts?
How do the voices make brave hero feel? Is he nervous? If not, why not? What does he know that we don't? Is he taking a huge risk? Does he have a death wish? Is he bored of life? Desperate? We have no idea.
