Not what I expected.
I sort of anticipated that there would be a "final girl" kind of stuff, but not in the way that I expected.
The final scene where they both shared a knowing glance as if finally figuring out who she truly is in the whole situation, gave me chills. It's as if he did not want to let her go, but at the same time, he knew he got played on his own game.
The storyline may have hit a plateau in the first half. But as soon as the first death happened, it immediately spiked and got me hooked until the end.
All in all, a great movie. Would totally recommend.