It's pretty clear. After Halo first trilogy, Alien Isolation is the best game of the last years. The amount of details, the sophisticated background and story, the incredible graphics and so on are turly keystones. There are no other games that can be legitimate called as interactive movies like these ones. Alien and Halo are the only two sci-fi brands that are making the history of this genre in the early XXI century. Why we still don't have a movie about Alien Isolation is for me a huge mystery.
It's funny because we the audience, having likely seen the movies, logically know that there should be other aliens even though Amanda wouldn't. And yet the first time you find the nest the game just ramps in intensity, just like you said.
If this is the part I think it is it was really well done. Spoilers a head for this that haven't played If I'm not mistaking this is where you had to contend with two aliens at the same time but the were usually far enough away from each other that even with the scanner it seemed like it was just one but close enough that the one seemed really fast and active alien.
people seem to crouch too much in this game thinking it will help. it only works when hiding behind something. stand up straight and run when you are seen whilst giving it some flamethrower to slow it down then hide when you get to a safe spot that the alien won't patrol non stop
Well this is nightmare mode and flamethrower fuel is used super fast and not very abundant. So I saved it all for the nests and I still barely had enough to make it through. There are sections where you can walk ahead of the alien and clear massive parts of levels.