I think we absolutely need [unutterable silliness] as a thread prefix. Then I wouldn't have missed this one for so long!
When in doubt, I sometimes fudge with "speculative fiction," but the story set on another planet seems to me as though it could be "SF" or "Fantasy," and which it is would probably have to do with how the reader "got" there. In general, though, if the laws of physics and so forth appear to be the same as in our world, but a key fact about the world has changed (e.g. the planet you're on), I'd usually call it SF.
They're really marketing terms, though, like "shoujo" and "shonen."
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