>>1256138Not OP but I get his concerns, this shit shows up right away when you go into the Visual Novel tag without logging in.
>>1255669Set up parental controls for your kid with filters for different sites and different keywords. If you don't know where to start, a quick google brings up several. Install an adblocker as well, preferably uBlock Origin, so you can block malicious or pornographic ads as well.
As for reporting, there's nothing you can do unless they're breaking the laws of whichever country they're hosted in.
Itch.io isn't actually doing anything wrong. Your best bet is to contact the administration of
itch.io and express your concerns about the ease of access of 18+ content.