Not the full soundtrack, but only what I managed to find on YouTube. If I find more I'll put them here.
Lighthouse Lower Levels (0:00) LightHouse Interior (1:39) Ruins (3:53) The Loop (5:00) The Lab (7:23)
https://www.youtube.com/watch?v=msj7OHiZpqk
Winter Palace Ambiance
https://www.youtube.com/watch?v=kVi1AUYcg2Y
Secrets Hub Room
https://www.youtube.com/watch?v=xBMlZDNCbjA
Cipher (Remix Medley)
https://www.youtube.com/watch?v=vkO-kBjQcBM
Back to the Video Game Music Archive
Which one is your favorite?