That's where the movie peaked IMO.
The kids rehearsing their quiet train station scene that they planned, and then frantically hurrying to do it loudly when they see a train is about to pass by, so that it can add some "production value", was impressive.
After that though, the movie splits those two narratives apart and doesn't do either effectively to me. It's not an real creature film because the kids don't even know that there is any sort of monster until the final act. So they're not hunting, running from, or trying to find any information about it. In the meantime, they spend most of their time making the movie, which never gets more impressive than the train scene.
And the directing was distracting, look at this scene from a technical standpoint.
https://www.youtube.com/watch?v=JVRdRQaccL0
Useless camera movements, odd cuts, weird angles. Just bad lol.
In Abrams defense though, I did just watch Jurassic Park last night, so that's a pretty high bar...