Overland the game look and feel

1) Could somebody suggest me on how to achieve the skybox color like you see in the overland game.
2) Also if I'm right the assets they use are low poly right?

I have here a link to what I kind of what to build: https://steamcdn-a.akamaihd.net/ste...58c2e3af5be3b102fdb49984fcfdee3b7.600x338.jpg

Is it the best to build the world in blender or using pro builder from unity, anybody experience what the best approach could be, because I want to build a survival game and this style fits pretty good.

 

The skybox looks just like a simple circle/vignette shape. You could literally just stick a white circle gradient texture there and tint it whatever colour you want.

You could easily prototype this look using models from - https://poly.google.com/

In fact. Here's a gas station model - https://poly.google.com/view/7rUkCX-AIR2