Thanks for the constructive criticism. At the moment, the biome doesn’t add any new blocks to the world. It’s not supposed to be a radical departure from the Temperate biome. I wanted to to be a softer version of the Temperate landscape with more rolling slopes and a few more trees.
As for making the forestation heavier, I have tweaked the values a bit, but having too much forest seemed to really just get in the way of gameplay. Everything would always be getting lost behind trees and you just had to cut them all down to fit your town anyway. If people want a more heavily forested alt download I can make that though.