As a whole this story didn't win me over. I didn't find the central metaphor particular appealing, and the title and the numbering of the chapters implied to me that the numbered things were instructions as in a self-help book, but they didn't actually take that format.
But I did find one particular scene very effective. The funeral scene where the dad picks up Nana's body and carries her up, and the aftermath where the mom leaves the dad. There was so much solid character interaction in that scene, and imagining him walking up there amidst the sermon and in front of the whole congregation and carrying her up, the daughter following after, that was extremely effective. Would make an excellent illustration in the hands of a talented illustrator--backs of the heads of the congregation, all in funeral garb, empty coffin, spiral staircase with the man carrying cilmbing up it, the daughter the only other active member running up to the front so she won't miss her chance, preacher in the pulpit oblivious of all of this even though all of the heads are turned not to him but to the people on the staircase.
For me spiral staircases make me think of summer on a lake. Since before I was born an uncle had a cabin on a Minnesota lake that was converted from an old Boy Scout lodge. Most of it is a big open space, but there's an upstairs loft area that was added in for a bedroom and has a tightly spiraling stair leading up to it. When I was a kid I was terrified of falling off of it so I would sleep downstairs on a couch. When I got older and could work up the courage to climb it, that was a small rite of passage for me.