RETROTALE.
WELP. HERE YA GO.
sans has green magic and can glow both eyes. his pupils are always green, unless his magic is drained. papyrus's scarf is red still, but can glow both eyes red. same pupil rule as sans, but red. undyne's spears are orange, her dyed hair is orange, same eye rule, and she wears orange lipstick. (undying's eye spear is a super bright orange) asgore does what he wants with eye colors. so does toriel. alphys is the same as normal. gaster's eyes are always blue, but nothing else about him really changes. grillby is made up of blue fire. muffet has pink eyes flowey is now a daisy with black eyes. asriel has white eyes and a green/white striped shirt. monster kid is the same, but with orange eyes. everyting is played in an snes soundfont with some exceptions... bonetrousle being super mario world... megalovania being earthbound... spear of justice being zelda... heartache a mix asgore is the same... spider dance being mario 64 ds... your best nightmare being a mix of everything hopes and dreams also being everything, but less chaotic. etc. frisk wears a reversed red baseball cap... a red shirt with black stripes... has black hair... black shorts... black shoes... and still shuts THEIR eyes, which are green. chara is the opposite... with the exception for the black pants... black stripes... and wears a beanie instead of a cap. the battle system is replaced with the one from earthbound, but you have added options that were in undertale but not earthbound. the soul system is there, too. you can also have random effects like earthbound, etc. the phone system also works like earthbound. there are easter eggs that reference mario, zelda, and such. most everything nintendo and more are sharing this universe.
This universe is STRONGLY associated with “Tale”. They’re not the same universe, but these dudes DEFINITELY know about “tale”.