Simplistic & could use work
When the last piece is played, the puzzle lines disappear and balloons float up. Then page 1 of the puzzle list appears, possibly after a pop-up ad. The ad bar is continually at the bottom. At top right is the control for music on/off. There is no "click", just music. It's an easy game. Your place is not saved; going back to a puzzle it starts again from the beginning.
My granddaughter, age 3, likes the game very well, and always got the top right piece correctly so she never noticed its oddity. She enjoyed the balloons and added clapping hands to the applause. The music has no choice of tune, and she turned it off and on several times. After all 12 were done, and several were done twice, boredom crept in and she agreed to go to bed. I feel this game was helping her recognize corners and edges. I helped only a little, and much of that was recovering from ads.