Everyone needs a second pair of eyes! My stories require tons of editing, but that's just me. Sometimes the story takes on a life of its own, other times, it requires extensive work.
Even for this review, I've spent over an hour editing suggestions and remarks. Please don't be overwhelmed.
Let me see if I can guide you through a few issues in the beginning. Please note: I only write extensive reviews like this for stories that engage me.
Regarding the title: Suggest>
Everyone Dies > since the word 'everyone' is plural.
In the brief description, no quotation marks are necessary.
Genre issues
Consider choosing 'horror/scary' as your first genre. For the second genre, sci-fi works. For a third, consider 'supernatural'. That's not a precise genre for the story, but it's best to use all three as it increases your chances for having your story featured in a Newsletter, and also for exposure during Quill nomination. Just sayin'.
War may be the next step in the plot, but that would be another story, right?
Since this is a short story, it would not be identified as non-fiction.
Plot observations
Quick edit. In the second paragraph the ending quotation mark is missing.
How long did the doctor live to watch his creation? It seems as if he survived to see the offspring of the monster.
"In the aftermath"
In the third paragraph, who is 'they'? Only the doctor, and the nurse who is mentioned once have seen Typhon.
As the days turned into a shadowy eternity"
Four paragraphs later
Jonathan, haunted by guilt and the specter of his creation's fury, monitored Typhon from the safety of the observation deck.
The sentence below is misleading, because Jonathan has seen the monster.
It would be an easy edit to rephrase (other than the doctor's)
In the depths of the laboratory, unseen by human eyes...
For me, the ending fell flat. How else can the story arc be closed? The story deserves a conclusion as explosive as the plot.
The last sentence was more an observation about humanity, which was already well-expressed as the plot unrolled.