I thought the notion of eliminating all life (especially humans) in the universe was way more terrifying than anything else in the film, and I thought it was super creepy how fixated the robot dude was with it. I remember being more creeped out and scared by the scene where he was talking about eradicating all humans in this totally normal tone than any of the gore scenes like where that woman got her head bit off. The ending was really good too although kind of predictable.

But definitely my favourite part was the audio. The one scene where it was raining outside and the alien was walking up the wall, the rain audio was panned to like the back left speaker it was so perfectly atmospheric but I get that audio is not most peoples first priority lol