Edge! Beast Ears! Colony!

(A RimWorld fanfic, but even if you haven't played the game, you can read it as accessible soft sci-fi!)

The sixth millennium. Faster-than-light travel remains out of reach, while humanity and genetically modified demi-human girls have spread across the galaxy. He Yun, who transmigrated from the twenty-first century, is now on his way to being sent off to develop a frontier world.

On this planet where primitive and advanced coexist, you can see tiny mousefolk clutching rifles as they charge at humans in power armor. You can also see sky elves soaring through the air, only to be blasted from the sky by the artillery of machine-folk swarms.

Calamities, anomalous entities, the supernatural... As a pioneering lord struggling to survive, He Yun knows exactly what he needs to do next. First, he'll open up the wilderness, grow crops and stockpile food, then advance technology once more. After that, he'll raise a banner, establish his territory, and hang every last one of those incorrigible, harmful pests. At the same time, he'll clear away confusion, educate the people, and rekindle the flame of civilization and order.

And finally... naturally, he'll give the beautiful, kind-hearted beast-eared girls a warm home.