Definitely a tearjerker: everybody dies, including the dog, which is usually the point at which I stop watching a movie, but the poster suggests they meet up in Heaven so I kept going.
I’m not going to go into a lot of story or execution details except to say that the “trick” of meeting his children in the afterlife (they don’t look like you’d expect them to look) was explained in a way that had internal logic and didn’t feel like a cheat. I have not read the book and don’t plan to (the sample tells me all I need to know and that is that I have better books lined up waiting to be read) so I can’t tell you how closely the movie aligns with the book.
The one thing about the movie is that is FANTASTIC is the message: that a man’s love for his wife was so great that he was willing to give up Heaven and join her in Hell. We need more movies like this, about couples who go through hell and Hell together, about the wonders that can be achieved by men and women who love each other working together to make a better world, even if it’s a surrealistic, fantastical afterlife.
So have a hanky (or two) ready and be assured, this has a happily ever after even if it’s not what one would call a Romance. It is definitely a romance, however. And bonus: the point of this romance is not for the woman to fall in love with a man just to demand that he change.