Amazing game! And amazing artwork. I haven't played a lot of text adventures before, but this game really made me interested in the genre.
I'm still not done, missing two mushrooms (I have tall, indigo, striped, russet, inky, skinny, broad and golden) and probably a lot of easter eggs, judging by the ending text.
A small bug: "EXAMINE TREE" works in all (?) rooms and says "The skinny sycamore tree has taken root is not here".