>>> spoiler alert <<<
If you are interested on the musical side behind the scene, I may expose a little bit more on the game design here.
The approach I have taken to design the game is by reassembling the chord progression that is common in lo-fi genre music. I have some basic codes to generate random chords and auto-correct them to the nearest predefined chords, prioritized based on lo-fi or jazz chords and the importance of each note in the chord. The algorithm is definitely not perfect but it will work for a game jam game.
I could have gone further to make this game more specialized for musician or even mathematician(base 12 numbers) but hey, the theme of the jam is 'seven' ; )