I have no idea what this was about and I was confused for most of it, and I loved it. Aside from Dylan O'brien's amazing acting, some incredible editing, and a million hidden messages, the storytelling is gold.
I will say I was not a fan of all of the flashing lights in this movie, but I know a lot of people aren't bothered by it. I had to look away some times but I still think it was an effect that really helped the story.
I also really can't tell whether I love or hate the fact that I don't know what to take away from this. I might be a little angry haha. I don't know what to do with my life now but I loved it.