Undertale <3 does something that no other game has done well. THERE IS NO 4TH WALL. THEY GRAB A BULLDOZER, SMASH IT INTO IT AND BURN THE CRUMBS IN MOLTEN LAVA.
Let me give you some examples.
Genocide Route: (not exact quotes)
Flowey- I brought myself to death, but I thought 'no I don't want to die'! I woke up like it was all a bad dream, I woke up- at my last save point...
Pacifist or Neutral:
Flowey- So you felt bad for killing Toriel? You decided to start over and spare her. You aren't the only one with that power...
WHY GAME WHY? IT IS SO CREEPY WHEN YOU DO THAT!
Especially sans... seriously. Let's look at some of the things he says.
"That's the face of someone who has been killed twice, welp, I'll make it a good third."
ASDUFFLGASM!