It was good and engaging overall, I never felt the urge to stop watching.
It mentioned some incredibly interesting concepts like the point they made that even though we as viewers feel sorry for Mickey for constantly dying, he in some way is in the best position because he doesn't have to fear permanent death. Another one was the loss of personality that happens after dying and being forced to come back over and over again together with the identity crisis of "who is the real me?" (Similar to Twice from MHA, but not as good). How the story briefly delved into spirituality with "god only granting one soul to one body, anything else being against the natural order" and they just left the untapped potential for a deep philosophical discourse rotting, while simultaneously mentioning MULTIPLE TIMES the church/company back on earth and on the ship!?.
Another thing that had a lot of potential but wasn't given any significance was Mickeys implied trauma (hearing Chainsaw noises, numbness when it came to following orders, maybe that was a cause for his personality changes?). It was very disappointing to see how little they unwrapped the sacrifice of Mickey 18, after he admitted that he too, still feared death.
It portrayed those very interesting and potentially deep topics so unseriously and shallow that I felt like I was watching the retelling of a child playing with its toys ( or how it looked in the childs head). Children don't quiet grasp human personalities in their depths and in early age lack the ability to properly feel empathy in a natural way. All conversations felt very uncomfortable but I think not in the way it was intended. I had a hard time seeing anyone aside from Mickey 17 & 18 as human (even the "good" characters).
The movie tried to be funny in a dark humour kind of way which prevented it from acting as an analysis of human nature but it also took itself too seriously to be funny, landing at a crossroad that made all interactions just feel awkward.
Instead the story focused on so many things (the points I mentioned before, the usual theme of rich and poor that Bong Joon Ho is known for and humans being the parasites after invading a new planet)
There are also very little logical explanations for moments like why the Mickeys have such varying personalities or why so many woman fawn over him (can't be because of his suave nature, that must have been another Mickey we haven't seen).
In the way of humanity being the aliens I actually liked how it was basically a better version of Avatar, they didn't need to make the Aliens beautiful and human-like to make us like them. All it took was them showing more humanity by saving Mickey, not seeing him as an expendable, than any human on the entire ship.
Ending/additional thoughts:
It was one of those movies that (without wanting to sound pretentious) would have been better if it had a lower budget and had to focus on the characters instead of expensive scenery and cool cgi aliens that need to be saved.
Robert Pattinson was amazing though, i love movies where an actor plays two roles in the same movie because throughout the whole film you really get to see their acting abilities and versatility. He really killed it with the nervous, jittery 17 as well as the irritable, driven 18.
I interpreted the whole movie as a lesson in empathy, because that was the biggest plot point as I saw it (like mentioned before, there were a lot of those).
The lack and presence of it, which isn't an incredibly unique idea but still nice to see.