This game could really utilize a generated heightmap that goes along with world gen.
Nothing that would change the graphics, but more that could account for terrain height in terms of what generates there.
You could use it to determine all sorts of things.
Random example: Flooding.
How awesome would that be?
Like, oh shit, nobody’s maintaining the dams anymore, and it just rained for a week, looks like everywhere but high ground is full of water.
There are a thousand other potential uses, mostly in terms of convincing-looking world gen.