Geometry Dash uses a simple tapping/clicking system to control different vehicles that react when a player presses anywhere on the touchscreen (space/up key(s), mouse, or “A” button if playing on the PC version) and can be held down to constantly interact (on some vehicles). Users cannot control the speed at which the icon is moving, the only way to change speed is by touching a speed changing portal. The timing and rhythm of the in-game music are key parts of the game, often in relation to each other and is my favorite game 🙂 My username on Geometry Dash is XmoD