The visual design here is particularly strong. The writing is good. I assume it was originally written in Spanish then translated to English, so there are a few clunky parts. I'm not knocking off any points for that though because I barely got my submission written in one language, let alone two.
I think the navigation puzzle is particularly useable. If I were to run this, I'd probably beef up the encounters though. I would also ask my players for a handful of facts about their characters that those characters wouldn't want to admit, to help set up the Madness Specter encounter.
I do think there's the potential to feel unrewarded at the end of the adventure. It does sort of have the, "it was all a dream" trope baked in. I'd recommend including a line to the GM to reward the characters something appropriate to the system they're playing. It doesn't have to be treasure, in fact I think it probably cheapens the experience a little bit if it is. But I could see a substantial experience reward, a long lost memento from their past, or an opportunity to permanently change something about the character to make the experience feel like it was truly worthwhile for the players to go through.