Reminds me of From dusk Till Dawn
Majority of the movie focuses on the 3 ppl in the bunker, here you are trying to figure out what's going to happen to them, parallel to George clooney and Quentin Tarantino kidnapping the family in FDTD, and last 30 mins of the movie BAM, there are aliens (vampires).
If you've never seen or heard of cloverfield you wouldn't even know where this movie is going.