It often features romantic or sexual relationships between female characters and cat-like elements. The art style might be highly detailed and focus on creating an alluring atmosphere.
The main differences might be in the way characters are portrayed and the storylines. Yakuza manga often focus on loyalty and honor within the criminal organization, while other crime-themed manga could have a wider range of themes and character motivations.
I'm not entirely sure specifically what 'koneko neko neko visual novel' is about as it could be quite a niche or not widely known one. It might be a visual novel centered around cat - like characters (since 'neko' means cat in Japanese). Maybe it has a story about the adventures of these cat - themed characters in a fictional world.