I know you have a lot of questions, I'll say this: I'm making the underswap mod together with lazybones and our team, but I'm also working on this mod (myself or asking for help with some sprites) here's an example

Oh my god there are 100 of us guys thank you so much It shows that people really like the mod

V1.001 and version 0

This sound is irritating

Underfell v1.12.6 finally version bye Underfell Hopeless

Underfell v.1.12.5

progress

Old house

MR!Underswap

By MR. B0B/Mark

underfell mini update: New flower designs, new dialog and description of Napstablook, New dialog Asgore

"the music was also corrected"

(v.1.2)