You can ask yourself many things with this. From morality (to mortality I guess), to group dynamics, to children with bad influences to bullying. Of course it's not that the movie points everything out, or spells everything out. Also for a movie playing mostly inside a building, this is very "far out"! There are some pretty strange things going on and by the end of it you will catch up.
Of course, the end will split a lot of people. Because while we are aware this is nothing ordinary, what we get to see is way extra ordinary. Is that something the movie can pull off? I'd say more no than yes, but it depends on the viewer. It's well done overall and it can be a pleasant watch, if you let it