This is extremely well made. The sound is soft and warm, the melodies are lush, the entry is very atmospheric yet never boring. I think The Starry Sea could have used a little more development in the end, but I also understand it not having that from the story point of view. And it works very well in a juxtaposition with dynamic Shooting Star.
Your usage of deep impacts does a lot of work in this sumbission. There are a lot of them, but not too many. They work wonders.
Being a bit new to this genre, Vocaloid was kind of strange to my ears, and I can only imagine how difficult it was to make it sound this fitting (maybe it wasn't, I really don't know it, but I'll assume it was). It was an interesting change from the previous songs, I think without it the last song would sound too same-y. Not sure if that was what led you to using it or if it was the plan from the beginning, but after my ears got used to it a little, I loved it.
All in all, a very impressive entry. Loved every second of it.