I will share my experience and thoughts of the vn here, I hope that this helps you improve!
SPOILERS BELOW!!!
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I played on the English version.
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My route: Made a team with the two other guys and spared the kids’s life, got the good ending right away.
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Played other routes too, I was impressed that it is possible to finish the task without help. Is harder, yet is very uncommon to be able to do this in a vn.
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You managed to make a different ending for every possible outcome! nice!
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The worldbulding that you did here is pretty interesting (similar to Fallout, but with enough differences). This has potential for a sequel or a spin-off in the same setting.
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For the first vn, you did pretty well!