Getting a little upset here that GOG is now selling stuff that is illegal in my region
You could look for a better region. Or campaign to have your region's laws changed. Thankfully the rest of us need not care about thy absurd legislation.
and unethical in general.
Ethics are rather arbitrary, especially as it pertains to works of fiction. Turns out there's no such thing as ethics in general. Turns out people generally have no issues with works of fiction that portray scenes and actions they may find unethical. For example, just about every hollywood action movie ever contains one or more of: violence, murder, lying, theft, cursing, adultery, prostitution, even rape. Just check what's on TV after 10pm.. I don't like it, but hey I'm not running around telling people these works are unethical. I play violent games too.
This is kiddie porn.
I doubt this is porn, AIUI GOG does not sell pornography.
Also it's hard to take it seriously when people call illustrated fictional works "child porn". There's a reason child porn is illegal, and that is because its production involves child abuse, a crime with victims. There are no victims and nobody gets hurt or violated in the making of a scene with three-year-old paper clips fucking each other.
Bigs is right: if you don't like it, don't buy it. Some other people may like it, and that's fine, live and let live.