For picross/puzzle lovers it's an amazing game. I've never played anything similar before, but I must say that bow it's one of my favourites. I bought this game because of the detective theme, never espected to find this gem. Story is really great, sometimes you see it coming, sometimes you don't, but it keeps you entertained.
For me, the strong point is the Picross. Gameplay is great, easy to follow, and the puzzles are very interesting, I was always eager to play more and more.
Art is really nice too, as expected of a Visual Novel.
After finishing it, I tried searching for similar games, but to be honest, no other Picross game has the quality of this one,
Completely recommended for you, puzzle lovers.
Hope they make another one in the future.