Why all the low ratings???

Rating: 8/10 (13 January 2019)

I've read loads of the comments and it seems people haven't even watched the movie properly, why do you need to know all the answers? Thats the point of a movie like this, we are seeing it from one person's perspective, so we dont get to know what happens to other people because the main character doesn't even know, so why give the movie 1 star just because YOU dont even understand how the movie works, plus how are people not understanding the ending...??? Its not difficult to understand... People really need to actually WATCH a movie properly before giving a movie such a low rating.
I for one thought it was a brilliant movie, ive watched it 3 times already and yes id love to see more as i found it too short. Dont believe the low rating reviews and give it a watch.