oh, this didn't get federated over to the main lemmy.world version of the community! :(
i'm 24 days late, but the thread is at the top of active for lemmy.world/c/undertale_deltarune now because i brought it over, so:
hopes and dreams, save the world, and undertale are all incredibly strong contenders for me. the use of leitmotifs! the key changes in hopes and dreams and undertale! the feeling of warmth and hope when once upon a time section C plays for the first time in save the world (ironically not hopes and dreams)! and of course, the emotion they all bring in context! toby fox absolutely nailed the music for the keyest moments in the game.
oh, and also shout out to a song that's genuinely pretty nice to listen to: can you really call this a hotel, i didn't receive a mint on my pillow or anything