I think I'd like to see just a little more risk to the game. Right now we can pretty much count on a VV living until ~70 years old. Some of the events create some problems, but an occasional drowning, boulder falling on a builder, snake bite, etc. with an event to tell the player what happened might make the game more challenging. Of course not to any children, (because losing the other twin for the sake of the birth of the GC was pretty traumatic)
I know that seems a bit morbid, but after the risk of starvation is gone, solving the puzzles are all there is to look forward to (that and my sick attempts at breeding a master race of triplet runners).