The intro piece of the book (roughly the first 18-20%) goes relatively well, albeit a bit slow. Not much happens, though we're introduced to our main character and some of her world. At this point, the story feels approachable and written well enough you can sink in.
After this point, it feels like the train progressively goes off the rails, as the saying goes. I nearly DNF'd when the main character and one of the other characters do one of the most careless things I've seen in a story in a while, which predictably ends poorly. At this point, you're doubting whether the MC has any common sense at all. They definitely felt like someone trying to get themselves killed, which made me quickly lose interest.
This continues happening. They meet characters who they know aren't to be trusted, and they still go along with them.
Starting at around the 1/3rd point in the book, so many characters get introduced (in more ways than one) that I lost the plot more than once. Tropes are woven in to try to give the reader something to latch onto, but I didn't feel like they were a good fit.
In a way, this book reads like a bit like Total Recall and heist-y/spy sci fi stories like Outlaw Star, but I much prefer either of those stories as they had a relatively good focus on the goal.
In The Brightest Stars, we drift along without all that much happening, with occasional twists that again lean on tropes or on plot twists not uncommon for stories inspired by the stories above.
As the story winds to its conclusion it feels like it just ends. Important parts of the plot don't even happen until the epilogue, which I found more than a little baffling.
In short, this really wasn't for me. I would have loved something using those same inspirations that leaned more on stronger character development, believable characters with believable courses of action, with a stronger focus on story.