An amazing series. It's a supernatural mystery, psychological thriller, and love story all rolled into one. There are a lot of cool ideas in the show, and many of them are done very well. Satoru is an interesting character, and I like his arc. He has a lot of inner demons, and the way he acts, from his body language to his flat out apathy, is very well done.
There's a lot of great scenes that showcase terror, desperation, and just flat out horror. I really liked the mystery of the show, as it keeps the viewer on their toes trying to figure out what went wrong, and how Satoru is going to fix it.
It also looks absolutely gorgeous, and does an amazing job portraying inner turmoil. The voice acting is done so well, it's truly a perfect cast that I wouldn't change at all.
The last two episodes definitely suffer from being too quick and not explaining a lot, but still, what's being presented is of a very high quality. It's just a shame it ends so quickly.
Despite being pretty short, at only 12 episodes, I think it does a really good job of pacing itself, making its characters interesting, and not going too fast, which is crucial for a suspense-fueled anime like this. I definitely think it's worth the watch, especially since it's not much of a commitment and is immediately engaging.