Amazing game! I managed to beat it with all 4 secrets, but the ending felt really abrupt. I took a look into your github source code, and found reference to a scene "the_end" that near as I can tell should play after defeating the final boss, but it doesn't; it just jumps directly to the "VICTORY!" screen. Is this a bug or is there some other way of getting the ending cutscene?
Relatedly, I found several other mostly minor bugs and wanted to know if you would like to know of them (and if so, where to send those). The largest is that the the audio file "JourneyToTheEastRocks" is not actually linked to in the book, while the rest are mostly minor rendering glitches or typos that can basically be ignored.