Well, now I've also done the Pacifist Route.
(SPOILER)True Lab was probably the most chilling area of the entire game. Like wow. Everything after that... it was okay I guess. Nothing quite as memorable as Asgore smashing the Mercy button or Flowey randomly showing up to ruin everything and become a photoshop nightmare to kill you. In fact probably my favorite part was when Flowey talks to you after you reboot the game. Because I'm definitely going to be doing a true reset. Don't worry Flowey and everyone else, all I'm doing is going to a different fragment, you can still enjoy yours!
Time to become a genocidal maniac...
Edit:
Oh wait. I already am; My avatar is Black Battler. Looks like I'm all set!