Now you're inside of Percival Lowell's nightmare.
The various platforms here represent planets!
Youch! Mercury is hot!
G)et the footgear, and ready it.
Walk across space to "Venus", and G)et the Bow and Arrows. Ready 'em.
Go on to Earth, and U)se the note for more information.
Once on Mars, T)alk to the metal woman. Note the foreshadowing.