However, it was initially quite a different game that received a very negative review by Keith Campbell in Computer and Video Games magazine issue 66, April 1987. The game seems to have been heavily reworked based on this feedback.
[+] Users who have solved this game
[+] Users currently playing this game
The only difference to the Yellow Door Adventure is at the beginning:
(you start in the middle of a desert), N (or S or E or W) (you see the Sun God in his bronze chariot) - now you can proceed according to Dorothy Millard's Yellow Door solution.
That's not quite true... but that's because this page covers two distinct games. The original version of Rays is not archived.
The later version of Rays, which is almost identical to Yellow Door, aside from the differences you mention is the one that is currently in the Spectrum archives.