Let me see your aureate world
----> aureate means gold, or ornamented/elaborate. I don't see anywhere where this becomes a flower or plant reference.
Its the hours of your evening
----> This was a good color ref
Don't tell me you don't need me
I'm the only one who's come, see?
----> This could apply to any leader of any herd, by your reasoning, and is by no means specific to Cassiopeia.
Not even the indomitable kin seeks you
----> I don't really get this. I don't understand where the definiton you give applies, but regardless Adhara's profile says she came to Helovia specifically to seek out Cassi.
But I need the crepusular back.
----> crepuscular is the sun rays that show around a cloud. I could see this as a personality reference, because Cassi is a silver-linings type of gal, but not really a color ref. Plus, you did a color ref already.
Really good try though!