Just like you, I really like horror and sci-fi so this movie already sounds great. I think that one thing that improved the horror side is how creepy Megan looks. It's so uncanny that you already know something is not quite right about this.
I really liked your review, very complete and clear
Thanks for your words, it is appreciated. They tried to make Megan appear as human as possible, but there is still something undeniably not-quite-right about her.