A script that defines the behavior for a custom scripted FlxState.

CustomState.hxc

import flixel.FlxSprite;
import flixel.FlxG;
import funkin.Paths;
import funkin.MainMenuState;
import funkin.MusicBeatState;
import flixel.tweens.FlxTween;
import flixel.system.FlxSound;

class CustomState extends MusicBeatState
{
	public function new()
	{
		super();
	}

	var backgroundMusic:FlxSound;

	var catSprite:FlxSprite;

	override function create() {
		super.create();

		FlxG.sound.music.pause();

		catSprite = new FlxSprite(0, 0);
		catSprite.frames = Paths.getSparrowAtlas("catvibe/crumb");
		
		// Place the cat sprite in the center of the screen
		catSprite.x = FlxG.width / 2 - catSprite.width / 2;
		catSprite.y = FlxG.height / 2 - catSprite.height / 2;
		catSprite.alpha = 0;

		catSprite.animation.addByPrefix('idle', 'idle 0', 12, true);
		catSprite.animation.play('idle');

		// Add the cat sprite to the state
		add(catSprite);

		// Fade the cat sprite in over 2.5 seconds
		FlxTween.tween(catSprite, {alpha: 1}, 4, {ease: FlxTween.linear});

		// Play the music
		backgroundMusic = new FlxSound().loadEmbedded(Paths.music('catvibe/darkagedrop'), true, true);

		backgroundMusic.volume = 0;
		backgroundMusic.play();
	}

	override function update(elapsed:Float) {
		super.update(elapsed);

		if (backgroundMusic != null && backgroundMusic.volume < 1.0)
			backgroundMusic.volume += 1.0 / 2.5 * elapsed;

		if (controls.BACK)
		{
			FlxG.sound.play(Paths.sound('cancelMenu'));
			backgroundMusic.stop();
			backgroundMusic = null;
			FlxG.switchState(new MainMenuState());
		}
	}
}