I'd like each planet to have distinct biomes, as we have on earth. They created a creature engine that works remarkably well to make weird but mostly realistic creatures (I mean, there are an unusual amount of big-butted creatures in No Mans Sky sashaying around, but they mostly seem like realistic evolutionary paths, given how bizarrely varied earth creatures are).
That creature engine could make dozens of distinct biomes for a planet, instead of the seemingly half dozen or less. 5/?