Geometry Dash has its ninth major update, version 1.9. It was released on November 9, 2014. It included two new levels, Blast Processing and Theory of Everything 2, a new user account system, the ability to choose custom tunes from Newgrounds for user levels, four new colors, four cubes, two ships, two balls, two UFOs, and a new shape, the wave. It also reduced the difficulty ratings on the first nine levels, excluding Stereo Madness.

Introductions
New levels include "Blast Processing," "Theory of Everything 2," and the "Wave" (geometry dash wave)game mode.
New music system. Create and share levels with custom music from Newgrounds.com.
Backup system. Store and synchronize your progress across devices and platforms.
User account system
New accomplishments, colors, and icons.
Many new details and level objects.
Customize the color of objects in the level editor, including four custom color channels.
Color coding in [the] editor makes different things more clear.
New Search Options
Improved server performance for download tiers.
The editor now supports copy/paste and has a 15,000 object limit.
Lots of bug fixes and improvements.

You can improve yourself by playing the trial mode of the game.