Fun idea! I like the concept of gradually unlocking more keys -- I think it may have been a bit more intuitive if it was tied to some specific ingame thing, like picking up an upgrade or something. I also couldn't figure out how to unlock the last few keys to stab the dragon without getting eaten first. I still liked it, though!

Hi Thanks for playing my game. 

Press enter with no input for hints. Here is a walkthrough, the text processing is terrible and you need to follow some pretty specific steps. (https://gist.github.com/Tocseoj/079524aaf67d591e44ff35046d210612)