I've hit another stumbling block - on the "mountain" stage (the third one) I can't seem to raise the biomes percentage over 29% (40% is needed to advance) even though they're clearly covering over half the map and all three biomes I can build have a tick on their creators.
There's a bug on the mountain stage where the game wants you to make wetland. There is not supposed to be any wetland on the mountain stage. Sorry about that, the only fix I've found so far is to restart the map :(
Ah, okay. Hopefully that'll get ironed out in a future update (I know it's still in development). Am enjoying the game a lot, so can live with re-starting the map. :)