The response options only change to pink when hovered over if they go to passages you've read before. Would've changed it so all links have the same colour when hovered over, but I couldn't figure out how to in time.
As for the rest, including how to get the True Ending:
SPOILERS
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When you get taken back to the beginning of the game (to the screen where it says "a game by DreamCartographer"), look closely at "DreamCartographer". The "Dream" part is in bold the first time you return to the beginning of the game, and looks clouded over after getting there from the second Bad End.
To reach the True Ending you have to click on "Dream" and type in the text box that appears (it doesn't matter what you type - you'll see why). This will enable you to escape the "Are you sure" scene and progress further. Just like before, you'll have to keep clicking "Escape". You will eventually unlock the way out. (If you do this after getting the second Bad End, you'll be taken straight to the scene in question.)
The fictional world where Rosa was with the hero is a place where Rosa and Nellie (the narrator for said world) lead fictional characters (the heroes) through an adventure tale so that the Void can feed on the heroes' despair when they get to the end of the adventure and discover everything was fake and they don't really exist. When Rosa and Nellie aren't doing this they live in the Void, which takes care of and feeds them.
(At least, that's what you're told is happening...)
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END SPOILERS
Thanks for playing my game. I'm glad you liked it, and hope this helps you understand the story better and reach the end!