While I was sick for 3 days, I decided to play Undertale and see what all the fuss was about. Well, I found out and although I've only played the Pacifist route, I've seen plenty of stuff detailing the Genocide Route to get an idea of what angry Sans is like. I honestly don't have the heart to take out all the chars. To give an example - I killed Toriel the first round only because I didn't understand the Mercy function - and then reset when i found out bc omg, I didn't want to kill her. I enjoyed San's humor as well as his big-brother-esque responses to Frisk about Papyrus (WHO IN ALL REALITY IS THE PUREST CINNAMON BUN IN THE ENTIRE GAME - BAR NONE), though I'm very interested in getting to see his different reactions to the time-shenanigans from using the Save Files. That's gonna be fun.
Basically, I love the game's mechanics and how it "remembers" things about your previous runs until you do a "True Reset". It's incredibly quirky, I love it and if you get the chance to play it, I hope you will too.