I’m guessing here, but I think Fairune Origin is the original idea for a game that eventually became Fairune. It’s a very short, similar game with just 12 screens and a few puzzles which are vaguely recognisable as those in the “proper” Fairune.
Your girl is taller and thinner, the baddies don’t seem to require you to level up to beat them, and it’s all over pretty quickly. It definitely feels like a working prototype, and, I suppose, if you see how much improved Fairune 2 is over Fairune 1 then work backwards from 1 to this with the same leap it makes sense.
Not worth paying for, but a nice little bonus.