The game is open-ended and will continue after you've completed all 12 of the puzzles. The description in the "Info" for Building Technology is correct. At least one of the puzzles is a new type of building. You didn't expect the info to contain spoilers, did you?

There are no new kinds of huts for the villagers to live in. Once you have completed all the puzzles, you've seen every kind of structure in the game.