Such a great game, I was kinda part of the annoying fanbase when it came out haha
So many memorable moments, characters, ost, jokes, everything in perfect harmony.
Neutral ending is my personal favorite : Asgore fight followed by Flowey, the perfect soundtrack, then the bittersweet epilogue on the phone ...

But now as much as I love that game I can't play it anymore. I've replayed it so many times that I just know it by heart, and when I get to the waterfall I just stop.
So instead I watch Etika's playthrough, because Etika and Undertale are forever linked in my mind. He has the perfect reaction on every moment, and you can see how the game is really affecting him. That playthrough perfectly encapsulate what both Undertale and Etika are to me (in good and bad ways : Etika's chat during the genocide run is probably one of the most toxic place I've ever seen)