Even though it kinda defeats the purpose of the "game" part, i dont see why not to include a unlock everything option, if you want to play the game normally just ignore the option and if you just want nut press the magic button.
newgrounds got me into jacking to games, then i started playing eroge visual novels, then modding skyrim to have huge bazoonkas and eventually i founds these kinds of forums filled with goodies to play.
I mean, ratings in general are really subjective, just because critics or the masses like or dislike something does not mean that i'm going to agree. But if the opnions are really skewed to one side theres probably a reason, so really low ratings most of the time means its a stinker.
I imagine the censorship happens a lot because people tend to be more squeamish towards sexual taboos then others and incest falls into the "unthinkable" for a lot of normies.
RenPy will always rein supreme, but if a game actually offers good fun gameplay then RPGMaker is also really valid, take something like Black Souls for example.