It is very intentionally ambiguous with it's exact time period and brings in a lot of items and decor from the 60's, 70's, 80's, and 90's for the sole purpose of coming off even more "dreamlike" which is a feel the movie was clearly going for.
What bothers me however is the ending, it feels pretty anticlimactic imo. They shot it multiple time prior and it always went down and got right back up, even from a point blank headshot, yet then at the end that point blank headshot is supposed to have worked? For no reason whatsoever? It would've been nice if they'd tried to do something different since the movie already established half way through that guns don't work.
You missed the entire point then
The movie is sort of a play towards STDs They tried everything to "kill it" but nothing worked. There's no cure for certain STD's
So in the end They decide to live with it, and she finds someone that will live with her condition. That's why they shot the scene of them holding hands with the monster following them. They're living with the "STD"
No, I get that they xidnt actually get rid of it and it was still coming for them, but it was stupid for then to even pretend like they'd killed it/gotten rid of it when all they did was shoot it, which they'd already done multiple times including point blank on the beach. If you want to at least pretend for a minute that it died or something, at least do something you hadn't already done before that was confirmed to not work. ---
"You need to lay off the peanut-butthurt and u-jelly sandwiches" - Neon Octopus