played undertale when it initially came out, I went in thinking it was a standard turn based rpg so I went about killing monsters and randomly sparing some because haha funny. then I got to undyne and her death scene affected me so much I deleted everything relating to the game from my pc, restarted it, did a true pacifist route once and didn't touch the game again until sometime last year
I was also incredibly high during her death scene so that probably explains part of it
it's a good game in and of itself but imo you can get much more out of it if you want to. the genocide route is easily one of the least gratifying experiences I have ever had playing a video game in my life
recently picked up the castlevania dominus collection and while I have various gripes with the games, I gotta say this is the best way to port 3ds games to different platforms lol