The new art is a whole different direction, it looks very good! Will say there is a visual bug when you get to the most zoomed out part, the terrain shapes outline that appears while lining it up to already placed terrain is off by several pixels. It is enough to make it difficult to actually see where you are putting your piece and cause incorrect placement.
I love the new tree with building pieces, and the irregularity of the tree pieces makes it a challenge to try to line up, and keeps it looking very nice and organic, nice!
The other gameplay changes make the game both easier and harder in a way. Its a bit harder to get enormous piles of gold until late game, but the new tree pieces give you a lot more life to stack up. Its a neat change!