I really love this.
SPOILERS: Once I'd gotten the ultimate, ultimate ending (at least, I believe it's the ultimate good ending you can get), I wanted to go back and get each ending for each screen to see exactly what you'd written, but it hurt my heart a little to do that to the poor Wumpus each time. I really appreciate the progression of what you know in each screen and how that's reflected in the text you see.
Well written and ingeniously structured! Thanks for this game!