I feel like it would cause depression even >:)

Well it wouldn't JUST be a copy of the undertale genocide route, there would be other paths you could take

I was thinking more a combination of different games

why would people be sad?

Probably through cutscenes and after game lore about what they have done

eh I wouldnt really care, Id probably be Flicking every boss picture off because of how hard they would be lmao

In the normal route, you just defeat the bosses, but to get the bad ending you need to activate a secret phase on every bossfight where you kill the boss.

why would I feel bad about finally defeating a basically invincible boss which made me die hundreds of times