Played some of "Ultimate Trial" which is an Ocarina of Time romhack oriented around combat.
The attract mode has the camera flying a loop through the Lost Woods. You play as Link, as an adult, who IIRC has gotten himself lost at some point in his adventures.
Anybody who goes into the Lost Woods will be lost and become a Stalfos.
Everybody, Stalfos.
So you find yourself in this sort of purgatory. A sprawling fortress-town, populated mostly by original characters with repurposed OoT/MM models. You'll find the back alley bombchu guy selling bows and bombs a few feet from where the magic bean salesman offers heart containers whose prices increase much in the same way as his beans did. Not having played much of Majora's Mask, I don't know if the models I don't recognize are original or not.
The gameplay loop consists (so far) of combat arenas you find in various parts of the fortress. Each is a set of gated battles excepting the Crypt area, which is more like a conventional dungeon that you try to clear without running out of hearts. No hearts drop from enemies, only money. And unlike in the original, you definitely give a shit about money because arrows and bombs all cost; they don't replenish from enemies, shrubs, etc. I see people calling it "roguelite" because of this, but I think the concept stands well enough without reduction to the dark souls of ocarina of time lmao.
It has a rather melancholic original score. It lends the setting a dreamlike feeling, which might have been intentional, maybe to diffuse the sense of being trapped in a presumptous amateur's attempt at "continuing the story." It's not a continuation, and probably isn't even a side-story, as I interpret it. Just a what-if whose plausibility or legitimacy you can entertain or not.
We're here for the combat, after all, and given that this is an N64 game with crusty camera issues, maybe this concept was unwise? It's frustrating in ways that aren't always the modders' fault. It's meant to be difficult, and pushes your combat skills in ways that the orignal games wouldn't have dreamed.
I'm interested enough in the story that I mean to continue at some point. I recommend keeping a map or some notes as you explore the fortress, because it's big enough and has enough stuff going on (more NPCs appear as you progress) that it can be overwhelming.