The puzzles are moderately difficult, and the solutions can be calculated backwards from the correct diagram, so you can think and derive the answer with your mind rather than trying and trying all over the place, so it was very pleasant to play and enjoy solving the puzzles.
And I really like the atmosphere of the story. I like that the story is connected to the previous Planetaario, and although I haven't played all your works yet, it made me want to play all of them.