Didn't try it but it reminds me of the time we had vertex alpha splatting textures on terrains, but barely any Gui whatsoever. Maybe consider a feature like automatic height mapping (water, permafrost etc), and very cool is to map steep slopes by rock and the more flat terrain by grass, then procedurally distribute plants on the grass areas only.
Thanks for the comment. Version 0.4 does have the option to procedurally generate terrains and to apply textures based on the steepness, but they are both quite rudimentary at the moment and I'm hoping to improve them in later versions.
Procedurally distributing plants based on the texture is definitely something to look into for a later version.