I love the idea of that space garden ! And the twist in your story makes it interesting.
The first track sets the scene perfectly, my only complaint if I must niptick is the synth melody is a bit harsh compared to the rest of the opening, I would have preferred softer/rounder. But still very cool opening.
The rest of the Ost was a great continuation of the story, well represented by sounds and effects.
I really like the Gardener's theme ! Might be my favorite track :)