Hello there! glad you liked the game! the city is actually the one making the upgrades for you, every building built gives you an upgrade! its automatic tho cuz we felt that you already have too much to do with the Rhythm! Speaking of which, city is a simple way to see your progress. I completely understand that you felt the need of more songs, but considering the fact that in a game jam most people will play less than 5 minutes means that it is better that the focus be on the polish than the content. Thanks again for playing our game!