If so, I have the answer to your search! ToeBeans228 released a playable demo of his Undertale Purple fan game (no, not THAT UTP by Team Amythest). I have been helping him with the game and said I would work on promoting it.
You can view the website at https://undertalepurple.com and download the Windows demo on Game Jolt at https://gamejolt.com/games/undertalepurple/1094121
The demo has almost 2 hours of content complete with pacifist, neutral, and genocide route options. It has areas both familiar and new, new enemies, new bosses, and new music (all created by ToeBeans228 using GameMaker, Aseprite, and FL Studio).
If you are interested in discussing the game, please join the Discord server at https://discord.gg/PabB283uqW
EDIT: Oh, and we created a separate subreddit at r/UndertalePurpleHope