This piece actually started as an attempt to create advanced harmony changes, and only once the piece was done it was put together in the form of music for a game. This is a part of the original score of the piece, and above the lines you can see the harmonic breakdown of the chords and their analysis according to the key:

 

 
Only after the piece was finished (until then I never even heard it myself, It only existed on paper!), I decided to turn it into a game soundtrack. Till this day, it is still one of my favorite pieces.