A story revolving around Johnny and his chosen family. Gaps in memory that are slowly but surely getting larger, to the extent of forgetting people entirely. Aided by hints of a folk song that takes on a tragic, terrifying color. A childhood memory that brings a certain type of solace.
The walls are closing in, but only metaphorically, because the world is getting larger and lonelier otherwise. A twist comes and makes things better, but the overarching feeling of the transient nature of memory remains. Time is fickle and we are reminded of this through the tale in various ways.