That is so not true. What you are saying is that it is legal to make kiddie porn in games, as long as it's not in real life. You are wrong.
In most jurisdictions, even artistic visual depictions of zoophilia is a criminal offence, just as visual depictions of people resembling a minor, regardless of the age the game tells you the character is.
We are in the position where we should criticize, if the law is broken. Visual depiction of zoophilia is illegal in most countries and pedophilia is a crime in all UNCRC signatory countries, which means (not limited to) the US, all of Europe, South America, most of asia, and Australia.
Pediphilia does exist in this game, there are two characters that very much look like minors, the brunette sister and the blonde sister who appears later. The brunette could be thought to be 18, but her demeanor places her in the 14-15 years range, tops.
To be defined as pedophilia the character's body should just look less than 18 years old (18 is the minimum age for characters in any pornographic production, regardless of media).
And who is to blame for the development of these games? Primarily F95zone who allows the developers to distribute the games on their platform. They have no idea what risk they're running by doing this. I told them multiple times. Suddenly, the site will be just gone, and the operators, owners, moderators etc. will be behind bars.