I have almost only praise for this song; the sound design is incredible, and at times it makes the simplest musical ideas feel fresh and complicated yet easy to listen to many times. However, it's a bit difficult to express what I feel is the main aspect to improve on. From a high level, the structure and melodies are good, but they could be great. I think there is a level of minimalism in the structure and design that is holding the piece back from being its full potential --a kind of very subtle same-y-ness feeling that covers the piece. This feeling might also be a byproduct of dissonance between the sound design and your choice of melodic structures. Hopefully these ramblings helped, and that you might have more insight into the song than me!
Absolutely lovely!