Hey, I'd buy the Tingle game! It's so weird, how can you not
buy it? (Rhetorical question. No answer needed. )
The whole time I was playing Layton, I felt that it could be easily done with Ren'Py. There were cutscenes, dialogue as you would have it in VN's, maps where you move around town by clicking on "hotspots" like doors or arrows to move left, right, up or down (or forward or backward), menu screen, and the changes to puzzle mode (you can find puzzles or you can get to them by talking to the residents).
The puzzles you can easily do. You would either input, click or draw a circle or outline around the answer. Input was usually numbers or letters.
Most of the puzzles I think you can find in a puzzle book. Some examples were the sokoban-type puzzles, how many "shape" is in this diagram, move x and y to the other side raft puzzle, etc. They ranged from easy to hard.
As you go around town, you can find hint coins. You can use the hint coins to help you if you're stuck with a puzzle. I finished the game with a lot of coins left over (about 140+ iirc). There's three hints you can get per puzzle.
There's also a lot of extras to the game. For example, there's a journal that helps you keep track of the story and gives a little inside to how Layton felt with what was happenning. There's also a gizmo and painting section where you can get pieces for solving puzzles. The gizmo, you will built something that will help you in the game while the painting is a nice extra piece to go along with the story. There's also a section that keeps track of all the puzzles you've done plus an "inn" section where you help decorate Layton and Luke's room (you get stuff when you solve puzzles). In regards to the story, there's also puzzles within the puzzle of the main Golden Apple mystery which helps keep player interest (at least imo).
If you finish the inn decor, gizmo, painting, and finish the game, there's also a bonus section you can access at the title screen of the game where you can access the sound bites, movie clips, and all these other extras including harder puzzles. There's also a "hidden door" which you can open when you get the second game. You can also download weekly puzzles.
Let's just say that it's one steller game. I think it can be done by someone here. It will just require getting all the right stuff from story, music, etc together and getting it done. Also, I think something like this would be the next step from the current popular hidden item-type casual games out there.
Anyways, here's one of the downloadable puzzles
you can try out and a cookie for reading all of this stuff I just wrote.