Okay ... so the title of this post was ... strange. But I respect the hustle of trying to rage people into useful feedback. Though it probably won't generate a lot of positive attention.
First issue, you need to choose a narration style. You open in the third-person but then immediately swap over to first-person narration in italics. You kind of need to pick one narrator (either the invisible one floating over the room, or the protagonist). Because all the switching gives tonal whiplash.
If you choose a third-person narrator, then you need to work on making the protagonist's inner dialogue a bit less stilted. When you read someone's thoughts, they're not supposed to sound like they are trying to write a novel. Never have woken up thinking in the cadence of, "I'll admit it, my parents were a dysfunctional couple. I still remembered when my father would hit my mother… only for both of them, after everything, to end up crying in each other's arms. Despite all those incidents, they always made sure I wasn't around to see it. But how could I not hear it?"
Those aren't inner thoughts. They don't sound or feel like inner thoughts. They're literary narration.
Second, you need to cut a lot of exposition. Like: "It had started a few months ago. One day it simply… appeared. It was during a plane trip that she caught her first glimpse. The sun was hitting the windows and she was watching the clouds without thinking about anything in particular, when suddenly she saw it piercing through them from below upward, motionless and enormous. She almost had a heart attack thinking they were going to crash into it."
Show, don't tell. Either show us the event or let the information be filled naturally by the plot.
As you may be able to tell, I'm commenting as I read along. The aforementioned exposition suddenly turns into the full-on scene that you've already spoiled for us through the exposition. But my question is, if you're already going to show us how the tower appeared, then why isn't that the opening of the story? That would be a far better an opening hook than anything that came before it.
After that, we go back to more summarized exposition about some Luke guy. The exposition is a problem. But the bigger one is that you slip with no warning in and out of them. So I never really have a sense of whether weeks are passing, minutes, seconds. One minute, I'm being told something long ago, and the next minute I'm right back in the protagonist's thoughts. You have to think of this like a movie. You can't just jump all over the place, and expect the reader to enjoy being dragged around. You need to take your time, show the things that matter, give the protagonist room for their inner dialog.
I started reading but couldn't keep going because the dialogue is marked by em dashes instead of quotation marks. Is there a reason for that? Why?
-Hallelujah. Preach the good word, dear sibling in Satan.
Then your have this section: "Iris looked at him with wide eyes. Astonishment gripped her chest in a way she couldn't conceal. —What? —Don't say another word. Those eyes confirm you can see it. Iris nodded slowly, without words. There was a brief silence between them, while outside the traffic continued its indifferent course. Then Luke added: —Excellent. You want to know more, I can sense it."
I get the gist. He's the first person to see the tower that is invisible to everyone else. Cool. Perfectly fine for the story. But you have this grand reveal that should mean a lot. Both to the protagonist and to the reader. This should be a major moment. But you don't give it time. Iris isn't stewing inwardly at what all this could mean. There's little physical reaction. Just a very abbreviated and rushed through. "You see the tower too? Sh ... don't tell anyone. Someone could be listening. Excellent. You want to know more, I can sense it"
As an added note, this last sentence is not how any normal human talks. "Excellent. You want to know more, I can sense it" is how villain Yoda speaks while twirling his mustache and tying Luke Skywalker to the train tracks. It's also emblematic of the entire problem with your scenes. It's exposition that shortcuts any normal human reaction. Like, for example, you actually having to show Iris begging to know more. Luke becoming genuinely excited about someone else finally seeing the tower, but forcing himself to keep his excitement to himself so that nobody overhears. Instead, Luke reads Iris's mind to just hurry the scene along. And because you as the writer seem bored by this scene and just want to speed it up, the reader also feels bored by it. When it should really be an establishing scene for the whole story.
You finally slow down in the next scene. And it's almost really touching and emotional. Because you are focusing on details, giving the characters room to think, react, notice shit. But then you immediately undercut the tension with more exposition. "After his mother's death, everything had gotten much worse very quickly. The doctors talked about accelerated deterioration, neurological factors, expected progression. But Iris always had the feeling that something more had broken inside him. As if the loss had switched off something essential that doctors couldn't measure in any test"
You're trying to create mystery, to give context. But none of that matters to the reader yet. We cared enough through basic empathy. We didn't need a magical cause, a timeline, or anything else. We had shared humanity, empathy, and a reason to care about a protagonist who has rushed past every other scene that might have made her interesting.
Finally comes the last scene. But again, the tone is too distant and Iris doesn't react in any sort of believable human way. There is no sense of urgency actually conveyed. All the audience really sees is "imaginary tower now is in two, floating over the city". There's no urgency there. Nobody is dying. It's just ... a weird magical thing that has changed in an arbitrary way. Maybe actually have her under the tower when it happens? Cower in abject horror before realizing that it is falling slowly? Have people react to the crazy girl screaming over nothing? That would create the urgency you seem to want.
Ultimately, the setting is cool. You've got good ideas. But you need to actually take your time building them, and do it properly. Let your originality actually shine in your ideas and your characters. Not by skirting the process of actually writing your scenes, building paragraphs with rhythm, and punctuating your dialogue properly.