Those are some really cool tracks! It's definetly noticeable that you put a lot of thought and effort into the tracks. I found it really helpful to have the editor's notes on each track, since I am currently trying to get better in music theory myself qand this really taught me something new, since I 've never heard of the chromatic mediant before. The more you know!
It's also great, that you and your friend recorded a few partrs for the Tracks. In my opinion it makes the tracks sound more real or personal in a way (espescially cause you can hear the breathing from the trumpet), it lcreates a nice contrast in the "digital world".
My favourite peace would probably be "If I got a wish", because it introduces the trumpet and has a very nice synergy with the celeste like synth, it is split into 3 seperate fragments, which all ecvoke slightly different emotions.
So overall very nice OST, keep it up! :D