To put another stone in the "literally any other story would have been a better story" pile, I remembered that
Don't Look Up, a shitty allegory/strawman about climate change, is a much better application of the "Meteor Armageddon" premise.
Because if you put a femtosecond of thought in GVH's world, the government is an absolute, abject failure, and the last chapter of the game should never have happened.
Realistically, if a meteor is going to hit the planet, and, as stated in the game, there's over 60% chance of it happening in three months, governments would enforce martial law and command
literally everyone to build underground bunkers/fortify underground rail infrastructure.
Within a few days of the impact, while the surface would be fucked up due to high CO2 and extreme dust particulates, it would mostly just be fairly dark and
very cold, and it would be available for raids and reclamation. Energy would be trivial if you use geothermal electricity, so underground farms would really not be hard to build.
Within about 2-5 years (I'm finding different figures online), solar photosynthesis becomes possible again, and within the next 10-50 years or so, you can recolonize the surface, global temps would stay low for a while. (Nowhere near FrostPunk levels, think -10°F or around -25°c on average, most of Pangea was closer to the Equator line).
There is definitely space for a VN describing the life of teenagers whose life gets thrown upside down because of a major cataclysmic event (which is not a fucking zombie apocalype/societal collapse scenario, we have too many of those, but more of a cooperative/martial law thing), and how they find their identity amongst the chaos, but
again, that'd be actually spending more time worldbuilding than GVH ever spent designing Fang's snoot.