So instead of suggest it for the core game (and of course cause of only 0,5% have unlocked The Flat Earthers Were Right!), i will suggest the same for someone who would create a mod for it.

https://psteamcommunity.yuanyoumao.com/app/254200/discussions/0/2592234299533436679/
http://i.imgur.com/e71FxTX.png

So first of all, it would be - like in the .png shown - a change for the worldgenerator.
In the last post of the thread i suggest even a possibility for a mode to restrict the world size to 500m in each horizontal direction.
These high, flat caves and the restriction of a 1000x1000 wide world would give the game a bit more challenge, apart from that, that then the ressources of the world would be limited (And maybe someones performance increase).

So, is it possible to create a mod for it, and how difficult would that be, or even would someone do this?