Made with passion. I've been a fan of this series for over three decades, and this genuinely feels like the conclusion we never got. The puzzles get incredible, and the writing is spectacular: it gets the "vibe" of the Lufia series while still being able to surprise you (often). Really feels elevated from the SNES/GB level of writing the original games had, like this is what they'd always wanted to be in the first place.
I'm rarely impressed like this with fan works, but I know I'm going to be replaying this in the future.