Also, what about the idea of converting buildings into bigger buildings. Like a house into a bigger house. Or a school into a university to gain more knowledge. Or the option to keep expanding your village.

Kind of like Sims or Civilization, etc. That way, you can keep playing even after all the puzzles are solved.

BTW, my suggestion to change more than just clothes wasn't meant to revolve around a "fashion" theme. I don't want to change it into a fashion show, but just something you could play with a little after the puzzles are solved or during the game.

Maybe along the lines of more complex puzzles, you could have the EASY mode where there are puzzles and a more difficult mode where there are more complex puzzles and more features than the easy mode.