First of all: Why is this thread not in the "General Discussion" section?
Secondly: There are good visual novels for kids. Your thoughts are too naughty if you really think that all visual novels contain adult content.
Finally: There should be no kids on itch at all. Kids are not supposed to have a bank account, and are not supposed to be able to buy games. If you are a parent, then it's your responsibility to keep in check what your kids are doing on the internet. It's not the fault of itch if you let your children register with a fake account and download adult games from itch to a hidden folder on your computer :P