That didn’t really answer my question, as that was already pretty clear by reading the description.
The developer's description and comment answer your question. This is not "just an Agatha Christie novel in playdate game form." This is a visual novel that uses a control interface and gameplay mechanics you'd typically find in a golf game. This is a marriage of both gaming concepts, visual novel and golf game. If you're looking for a golf game, this probably isn't it. If you like Agatha Christie and golf games, this may be up your alley.