I have seen many stories about this but now it's released and it seems pretty cool so I wanted to share. And on sale at Epic Games. Here is a article from PC Gamer:
~Airborne Kingdom is a hypnotic city builder where gravity is your only enemy~ By Fraser Brown on Dec, 18 2020
https://www.pcgamer.com/amp/airborne-kingdom-is-a-hypnotic-city-builder-where-gravity-is-your-only-enemy/
Small quoted from linked source
"Fight nature with your best friend, coal!"
"The basics are familiar and conventional: you build simple production chains and infrastructure to fulfil the needs of the city and its denizens, with the demands of both getting more complicated as you expand. Power, food, factories, morale-boosting diversions—there's loads to build, but you'll recognise all the categories. All this is happening in the sky, though, and that's a pretty substantial wrinkle.
Airborne Kingdom launched on the Epic Games Store yesterday, and rather conveniently it's also part of the holiday sale. It's not going to keep you going for as long as something like Anno or Cities: Skylines, but it's just right for a weekend of creative city building.
Airborne Kingdom doesn't feature any combat or even a whiff of conflict, at least not with other people. The war against gravity, though, never ends. Physics is a constant obstacle, and more than anything else it's that force of nature that determines your city's layout. You start out with just a little town centre, like the one above, gently bobbing away in the sky, perfectly balanced. But once you start placing houses, hangars for your planes and towering minarets, it's going to start sinking. You'll need to generate more lift, and you're going to need to make sure it's all even.
Too much tilt and your citizens will peace out. And who can blame them? Nobody wants to live in a place where they have to nail down their furniture, or where they're greeted by a view of the ground, miles below them, every time they look out the window. They can stomach a little bit of tilt, but I can't. It just looks like a disaster waiting to happen. And it only takes one little building to push it over the edge."