Not a bad nor good game. The problem here is that it's a Layton's game.
The episodic format makes the misteries easy to guess, and the history of each is too short and simple because the duration of the cases. After finishing the game, Level-5 don't answer the most important questions: who is sherl and why is a talking dog? and where is Professor Layton? (literally is called Layton's Mystery Journey and it's never discussed in the game).
The big problem here are the puzzles, from someone who has played the six Professor Layton games (and the crossover), they are very easy, too easy to resolve. The absence of akira tago is noticeable, besides the dificulty, some others have the "thinking out of the box" with stupid and nonsense answers.
It looks like it's oriented to the casual public that has never played a professor's game, but that leads to what was said above: simple history and easy puzzles, making those who have played the entire saga find it simple and boring. Hopefully Level-5 learned and don't do this in The New World of Steam 🙏