This is a masterpiece.
Although I don't like so much the puzzles (even less in YI where they can be annoying) they are very, VERY well designed in this level. Some of them were almost the same (I mean, using a sequence of melon(s)->P-switch->Red Platforms or in other order) but there was always a detail that gave them a special vibe and gameplay. You did an awesome job with tilesets and palettes too, some of them were very pleasant aesthetically (like Door 5 ) and if that wasn't enough, there was also FUCKING AWESOME custom music that really is very well done for contributing the hack's theme.
The only negative point (and honestly the reason why I'm giving this 4 stars instead of 5) is that is literally imposible to reach 100% without knowing (at least) the very first password, which seems to not being knowable by purely playing the hack (at least as far as I know, let me know if I'm wrong), forcing you to recur to "third-party" sources.