Fantastic! I'm usually really not a chiptune guy, but i love this!
First of all, the production is great! While most people tend to do chiptune in a very bare form, to stay "authentic", but you put the chiptunes at the front, and then create a whole world of modern production around it. To me it's very reminiscent of Celeste and Toby Fox. Great stuff.
The actual composition is awesome too! I like how you take your knowledge of musical theory and use it to boost the narrative of music's purpose - in time signatures, tempos and harmpnically. On top of that, your use of leitmotifs is fantastic, and really helps to "strengthen the bond" between the tracks, which reminds of the works of Toby Fox.
Overall, your ideas were very original and you executed them well, and the entire package (including the story and the visuals) seems to be an indie platformer begging to be made. Great job!