Tiny Towns: Underground

From BoardGameGeek:

Space is tighter than ever, so the creatures of the forest have begun building downward in Tiny Towns: Underground. These new underground buildings leave room on the surface for resource cubes, allowing you to begin your town in the center for a change. Cottages are being replaced by stylish Turf Homes, and a collection of other underground constructions allow for new possibilities as you break ground on your next village. -description from the publisher