What is the shape of the initial character in Geometry Dash?

What does the background color of the game in Geometry Dash change based on?

How do I change my character's movement speed in the game?

What happens when the character hits an obstacle in the middle of the game?

In Geometry Dash, players can customize their characters.

In practice mode, players cannot use respawn points.

A breakaway door opens the two-player mode.

Rebirth points are marked using red diamond-shaped gems.