I downloaded it a couple of months ago, and have finally had a few hours to get to play with it, and it's excellent and very calming.
There's a GUIDE here, although you can start playing immediately by choosing a colour, scrolling around the existing town and then clicking in different directions. I love watching the seagulls circling and settling on the rooves as well.Build quaint island towns with curvy streets. Build small hamlets, soaring cathedrals, canal networks, or sky cities on stilts. Block by block.
No goal. No real gameplay. Just plenty of building and plenty of beauty. That's it.
Townscaper is an experimental passion project. More of a toy than a game. Pick colors from the palette, plop down colored blocks of house on the irregular grid, and watch Townscaper's underlying algorithm automatically turn those blocks into cute little houses, arches, stairways, bridges and lush backyards, depending on their configuration.