I don't think theres an option for that, the only time I see a report option is for individual comments
If Runey made a post about it, then it must have had a negative effect. I really wish they IP banned them. Also, I think only you can see who rated your game Runey and only you have the option to report them for those ratings. I did send a message to itch.io support about the troll and all the images you shared. If anyone else want to report them as well then contact them with an email at support@itch.io