You likely won't be able to upload levels or save your progress to the official RobTop servers.
While repacks are a great way to test a game, Geometry Dash is incredibly affordable (often under $5). Buying the official version offers: Compete with players worldwide. geometry dash fitgirl repacks
Official FitGirl releases are generally considered clean of malware (provided they are from the verified source). You likely won't be able to upload levels
Files are shrunk to the smallest possible size to save bandwidth. geometry dash fitgirl repacks
Thousands of unlockable icons, colors, and effects.