Thank you! I appreciate the kind works :)
In terms of the key words, there should have been somewhere around 17 that you could get I believe. Some of the key terms would lead to a chain of them, where you'd have to use one after another to get them. I probably didn't make it obvious enough, but if a term in the dialogue had braces around it like [this], you could learn it, but you had to go back in the menu, then press learn, rather than just click on it or something. It was more confusing then intended.
The dagger had a clue but you had to ask about that key term "ceremonial dagger" from the guy in the forest. So if you didn't have the key term, then you wouldn't have known where to look unfortunately.
I'm glad you liked it in spite of the issues you ran into. I plan to polish it up in the near future with some more key terms, art, music, and maybe an extra item. I do plan to make more games like it in the future :)