This really gave me some Chronno Trigger vibes (I know you were not going for a full 16-bits sound, but I couldn't help it :v). The OST is very varied in tone, atmosphere and energy, while being coherent and consistent. The story progression is very clear and satisfying to listen as well.
I really liked how you strongly remarked the accents in some tracks, and your armonic richness was sublime. it really makes the difference when it comes to make it sound natural and dynamic, and a clear example that you don't need High quality libraries to make it sound natural (Obviously the Midi sound was an artistic choice in this case )
I don't have too many more things to say, You clearly knew what you were doing and your writting looks very experienced. Fantastic work!