Wow. I'll totally give this movie credit for making you think. And I think all the critics are super excited they are smart enough to figure it out given the decent ratings. But between the crazy writing, the acting, and the character development that makes a Bond movie look like Downton Abbey, this movie was completely laughable. Can a movie get by on an interesting sci-fi premise and an ok production quality alone? This movie bets on it for sure.
The physics of this universe are confusing at best, and contradictory at worst. The fight scenes between forward moving and backward moving people makes little sense. They even have to give them colored armbands in the final scene so you can have any clue of what's going on.