Far outside my usual style, this definitely sits solidly in YA territory, though it definitely surprised me in a positive way.
The story follows the sterotypical YA protagonist who is both mundane/underwhelming, yet at the same time not only is she special but singled out to be the best. It's also got the teenage crush + love triangle that permeates these sort of stories, tropes abound. However moving beyond that, the actual story/premise were good, not only that, but the final quarter is intense and brutal. I kept mentally prepping for the next corner turned in the plot to undo everything with some sort of deus ex machina, taking things back to easy happiness - instead each plot turn seemingly kept folding in on itself, further into an inescapable dark hole for the protagonist. Definite kudos to the author for taking it that way.
There are some spelling/grammar errors, other than misuse of passed/past a couple times, they seem mostly genuine typo & editing issues versus writing, so I didn't find them too bothersome. There are also a huge number of loose threads held over from the beginning section of the story that never really get answered or explained in any way. The story framing was probably my biggest issue there, both general story structure and loose ends would have likely been solved by opening the story with Alex waking up in the airplane immediately launching into the real story, then briefly backtracking/flashback into the lead-up, but instead of that we get about 40-50 pages of lead-up that both takes too long fitting things in and at the same time seems noticably rushed. If you can get through that rough beginning though, I definitely think the story was worth sticking with in the end.
Over all, if this is a first published work as it appears to be, I'm glad I came across it and will be curious to see future work.