Double review time. I watched both movies back to back and chronologically the second movie takes place right where the first movie ends. So it's worth watching them back to back.
Happy Death Day
And Happy Death Day 2U
Let me just preface this by saying that I have been known to love movies that no one else likes.
The first movie is based around a woman at College who wakes up in a stranger's bed with a massive hangover on her birthday. She goes about her day and ends up getting killed. When she dies she wakes up at the start of the day again.
It's a modern day Groundhog day but it's also a horro/thriller.
I thought the movie was very well done. There's lots of black comedy thrown in. Without the Groundhog day premise and the crazy antics it leads to, this would be just another slasher flick. But the time loop adds another level to it that makes it a very enjoyable movie to watch.
Which brings me to the sequel...
Honestly, there's not much I can say about the sequel without ruining the first movie. The sequel starts right where the first movie ends. The sequel is still a slasher/thriller/horror movie but it adds a large amount of scifi in there and it also gives a decent explanation of what happened in the first movie.
For the scores:
Happy Death Day - 9/10
Happy Death Day 2U - 8/10