It's nice how it ended by showing them still having goals to move towards. Getting that Silbegan cameo was a highlight for me! Tied it back to the beginning of the story.
Let's talk about setting- product design. While the story showcases how the figurine industry provides comfort and nostalgia, it's a fine example of the consumerist/petroleum age. Things like comfort and nostalgia have become commodified, regulated by the exchange value instead of their use value. That's why poor Silbegan can't get a proper figure- he doesn't move units.
And behind that, it is a facet of the external costs of the petroleum age. Plastics are one of the derivative products of oil refining. All of which have negative environmental consequences- solvents and microplastics and pollution and climate change. Our lives are immersed in plastic products, plastic packaging, plastic surgeries, because petroleum is the most effective fuel for global domination. Once power gets addicted to oil, the plastic is an inevitable byproduct.
When I see those gacha products they make, I remember the happy meal toys and action figures of my childhood (I am G.I. Joe and Ninja Turtles old). All those toys I begged my parents to spend on are now in the trash. Kasane's gacha products fill us with childhood glee in the present, yet their destiny is landfill. It's very doompill.