Very peaceful! I enjoyed finding out about new biome types and the introduction of animals suddenly recontextualized all the tile placement I was doing.
I did run into some weird error with a blank tile, which when selected just gave me a weirdly offset 9 that couldn't be placed:
This was pretty deep into the game and didn't break anything though.
I think you could afford to have the target numbers increase a little more rapidly. As it was I was at like 10x the target for the entire game...