UNDERTWIST is a fan-made game inspired by UNDERTALE who is made by Toby Fox.
This game has a similar idea as UNDERSWAP and STORYSHIFT, yes, it's a game where the characters are switched, where:
UNDERTALE | UNDERTWIST
Frisk | Sans
Flowey | Napstablook
Toriel | Muffet
Napstablook | G̸̢̖͓̘̦̙̟̻̓ͩ̂ͩͧ͟ͅa̴̩̦̱̻͍̞̱̗͆ͧͮͬ͆̇͟s̬̹ͬ͑̂͡t̶ͬ͐̈̊ͫ͆̏̔̊͏̧͕͙̙̭ͅe̊ͧ͘҉͈̫̩̯̣͖̳͠r̴̡̭͖̠̣ͪͩ̀
Sans | Asriel
Papyrus | Chara
Grillby | Frisk
G̸̢̖͓̘̦̙̟̻̓ͩ̂ͩͧ͟ͅa̴̩̦̱̻͍̞̱̗͆ͧͮͬ͆̇͟s̬̹ͬ͑̂͡t̶ͬ͐̈̊ͫ͆̏̔̊͏̧͕͙̙̭ͅe̊ͧ͘҉͈̫̩̯̣͖̳͠r̴̡̭͖̠̣ͪͩ̀ | Monster Kid
Undyne | Grillby
Monster Kid | Undyne
Alphys | Toriel
Mettaton | Alphys
Muffet | Mettaton
Asgore | Papyrus
Chara | Asgore
Asriel | Flowey
Jobs | Volunteers
Game Developers | UltimateNuke, ClickteamDeveloper
Sprite Makers | UltimateNuke
Beta Testers | N/A
Music Artists | Ganae_Music
Director | UltimateNuke
ABOUT THE GAME
Long ago, two races ruled over an unknown planet in peace: ELEMENTS and MONSTERS. One day, war broke out between the two races. After a long battle, the elements were victorious. They sealed the monsters under MT.EBOTT with a magic spell, leaving them with no escape, unless they have 7 different elemental souls as a monster scientist stated. Throughout the recent years, six elemental children fell down into the mountain. Legends say that those who fall down there never return. But there was a child, a special elemental child, who changed the whole underground. But how? YOU're the one to decide...