The logic mistake of teenagers everywhere: "They don't understand me, that means I'm smart."
Hate to break it to you, but even after beating your game, I still didn't really like it. The issue isn't the difficulty, it's that I didn't find the poetry or the riddles entertaining. ( The general narrative writing wasn't compelling, either, and the ending didn't feel like a reward for the effort.)
I can't blame Quiller for not getting invested. If asked by any of the readers who had trouble solving it or gave up on it because they couldn't be assed, and wanted to know if they should go back? Honestly, I'd probably shrug and say they weren't missing much. You have a text input mechanic. Great. I'm sure that took a lot of effort on your part, but it was the only thing about your game that I felt impressed by, and it was over-used. Besides, impressive is not the same as 'fun.' :\
By contrast, Betaband's story was sinfully easy, damningly short, and does not even belong in the mystery/puzzles genre (though it still meets Seth's requirements, since a riddle / puzzle just needs to exist in the story) ... and I still found it way more likeable. Bucky is correct in that your goal is, ultimately, to entertain your readers.