So I saw the movie "Skyline". It's shockingly similar to our "Day 2". It even has titles of "Day One", "Day Two", and "Day Three".
The movie was very close to being good. The biggest problem for me was the structure. They had a good idea where they could keep the characters together inside an penthouse for most of the movie. And when the very first shot is the aliens descending from the sky you might be forgiven for thinking that you're going to be going for a fun ride and avoid that whole boring exposition of your characters where they mostly don't have any dramatic tension. That is until the title "15 Hours Earlier" comes up.
Save the Cat could have saved the picture. One thing you need for a movie like this is the "half man". The main cast needed to run into a survivor -- someone who's seen the dark side. They actually do end up with a half man, and it's sorta interesting, but it's a 3rd act element rather than the 2nd act element you'd expect.
The aliens look nice.