Thanks a lot for the feedback. Yes once you pass the intro the game continues in 'endless' mode where the objects are randomly generated. I would've liked to add some kind of goal and more progression but didn't have time.
For the theme, I went with the interpretation of playing a role that you wouldn't normally play. My idea was to style the game as a resource gathering RPG, but the main character is controlled by AI, and the player takes the role of the sound effects and background music. It's different from a typical rhythm game because the events are tied to the actions of an AI character exploring the RPG world rather than directly based on the music . I think if I had more time to add additional mechanics it would've sold the idea a little better. The theme definitely pushed me to make a unique game I wouldn't normally make.