Each level in the game is built around a unique soundtrack, usually a funky electronic song. The music in Geometry Dash is not just for listening to, but also a guide for the player. The rhythm, tempo, and crescendo of the song determines when you need to jump, fly, or dash past obstacles.
I really enjoy that the levels are short in Geometry Dash World, because it makes the challenge feel achievable even if I fail over and over again. Each world feels different, and unlocking icons is a fun bonus.