I agree, the whole mine shaft section of overture ,for me created so many mental thoughts, 'where am i, how big is this place, why is this/that here/there, how long does it go down, what's that noise, oh god i hope there's nothing in this next room' and so many more. The developers control what the universe is (and that depends on the writers I suppose). I was captivated and legitimately shit scared throughout the whole game. Finding the shelter at the end made the mind think even more 'woo whats this, whats down there'
getting clubbed on the head and having the game end was..cool and potentially bad, one because there's something down there, two, because we dont know what DID hit us ( at the time).
The first section of BP still held the overture scaryness because we had no idea what was going on, once first contact was made with the enemy that pretty much stripped down the scaryness to
cheap-tension I call it. Gone are the mental images, and now it's just a goose chase with hostile-for-no-reason-or-explanation enemies. Kind of killed it for me. BP didn't have that scary feeling, well it did, but a different kind, mainly because I didn't want to die from the silly 'infekted mooootants'. It could of been so much more, so much deeper, but that's down to the writers of course.
Requeim was ok too, nice that them stupid monsters are gone, but just felt stripped down even more, shame penumbras over