About salt resistance, i dont see this as being neccessary. Everything is spreading out from the shallow seas, so it will already have salt tolerance as neccessary IMO.
Im not counting bacteria in this NES, its safe to assume there are millions of different species of bacteria and single-celled dudes floating around.
I think there will be some soil on land, from millions of years of coastal plants like the 'urchins' eating away at the rock, and then dying. And millions of years of the new coastal animals taking corpses from the beach, spreading nutrients further inland with their waste products.
IMO even without life, erosion would still create gravel, sand and clay where simple hardy plants could establish themselves. Its not neccessary to have some fancy acidic mineral dissolving stuff as far as this game goes.
@Lord_Iggy, im on 56k so i cant really watch videos (roughly 1 minute to download 2 seconds

). Can you tell me an more about the videos you linked to?
@cvlowe, I really appreciate you taking the time to do that! But please dont put yourself out. It seems a difficult and tedious job. I do have the species stats saved from every update (not listing ones that died out straight away), i could send them to you if you want.