If you clear the score, then you can be the Empress during the ending.
Yes, you get a recap of things that happen in the present as well as the near and distant future as a result of your various choices during the game, and you can continue playing afterward, if you want.
Viewing post in Caliross, The Shapeshifter's Legacy comments
You can only see the ending once in the game. Technically you could say it's not set in stone, but unless you use the debug tool, you aren't going to watch the ending sequence again afterward.
I'd have to double check, but I think you get a variation of the courtesan ending if you are the favourite while being involved with Eliza.