The cover and map art are both very effective. The layout is very clear. I really like how the "best" outcome for this adventure is kind of quiet, almost underwhelming. Pretty much any ending could leave the players on a strange, unsettled note rather than a triumphant one, which feels very appropriate for a classic sci-fi/science fantasy story. Very good entry, easily among the top.
Joff is an excellent inclusion. It's always great to have a weird little guy to interact with.