Just finished this. The beginning and middle are amazing. Deeply atmospheric and anxiety inducing stuff ahead of its time but towards the end, I think it turns into silly 50s sci fi pulp with a rushed ending and lots of asspulls. Overall pretty good but the last parts turned a 10/10 masterpiece into an 8/10 for me.
I also skimmed through the 70s remake after the author went full commie and it seems that the more overtly political stuff added to the story hurt it rather than help it even from an anti-imperialist propaganda point of view, the original is far more subtle in its approach and it works for the better.