I am very happy that you played my game. In fact, I was learning GDevelop for the first time when I started the jam. I really found it very easy to learn, but I did not have the time to know more. So, the game should check if all buildings in the level are completed ( which I did not finish yet actually ), in that case it will advance to the next level. I am working now to fix this and may publish it after jam voting phase.