The rocks (that remind me of extracted teeth!) are made with vue primitives (cube, 2 pyramids upturned and a sqashed sphere) that have been metablobbed.  I made some hangy rope/vine things very simply in Hexagon (can't do complicated) and used an ecosystem to get the vegetation growing down from them.

That's as far as I've got so far.  Haven't worked on the atmo or anything else yet. 

Gill