Although I do agree that the theme is very restricting, it is most likely intentional. Since a restrictive theme necessitates that you be more creative when interpreting the theme.
"Rewind" doesn't require you to interpret it as rewinding time, you have to be creative and find synonyms and other uses of the word rewind. Such as rewinding a VHS tape, or you could interpret it as something going backward; it doesn't have to be the time itself.