"You killed Niko.

You monster. You should've listened to that computer in the beginning, or that popup that appears when you try to close the game. Now, the Sun is broken, Niko is dead and gone, and the title screen will look like this to remind you of your permanent failure and murder.

Screenshot taken from the original 2014 freeware version.
Named after the track that plays in this scene: My Burden Is Dead."