There are these weird surprises throughout the game that will keep you on your toes. Like, you'll be cruising along, and then suddenly the gravity will shift or the screen will start spinning. It's so cool! And the cool challenges - like, trying to collect all the coins or complete a level without dying - will keep you coming back for more.
Codes of Vault of Secrets | Geometry Dash - YouTube
The attention to detail is also really impressive. Like, have you noticed that the music changes slightly each time you play a level? It's little things like that which make the game feel so polished.