It would be better (to get comments adn feedback) if you upload one piece after another, because commenting on all of them is difficult.
To talk about the structure of the songs I would need to see the score (if there is one). Some of us here love to see scores.
I don't think that complicated harmonies are always better, many times simple progressions are good enough.
Anyway I am listening to one ot them now LILLA DU: this track sounds good, there is no saturation and it's all well balanced (to my ears). I like the happy mood of it, and the variation along the piece.
For example, in Untitled, the first minute consists in 4 repeated chords... This is something I'm not used in others styles I know better. That's why if there is no variation in the whole piece, I lose interest. However, I understand this music has lots of fans...