Most people would probably find this movie extremely disturbing and traumatising to watch, and at first it might be that way, but as the story progresses, everything slowly falls into place, even the scenes that were hard to watch.
This is a good movie with an important message, but it's definitely not for everyone.

The acting was phenomenal, considering the number of uncomfortable scenes in the movie. Both leads did a really good job.

The camerawork is great, and there's an interesting use of horror elements in the scenes that were shot in "the room", although the lighting could have been better in some of those scenes. Certain scenes could have been constructed better, in terms of music and so on.

The movie also failed to include some important lines from the manga, such as: "Look at the people below" in the suicide scene. But despite this, I still found the script to be well written, and it takes up the theme of suicide without directly addressing it.
The ending was beautiful and perfect.

Overall, it was a great movie, and I would rewatch it again