Система перехода между сценами. И главное меню. Типа.

scripts/Startup.cs

@@ -0,0 +1,50 @@
+using Godot;
+using System;
+
+public partial class Startup : Node2D
+{
+	private enum State
+	{
+		Default,
+		Transition
+	}
+
+	private State _state = State.Default;
+
+	private ColorRect _colorRect;
+
+	private AudioStreamPlayer _music;
+
+	private double _transitionTimeout = 0;
+	
+	// Called when the node enters the scene tree for the first time.
+	public override void _Ready()
+	{
+		_colorRect = (ColorRect)FindChild("ColorRect");
+		_music = (AudioStreamPlayer)FindChild("AudioStreamPlayer");
+	}
+
+	// Called every frame. 'delta' is the elapsed time since the previous frame.
+	public override void _PhysicsProcess(double delta)
+	{
+		if (_state == State.Transition)
+		{
+			_transitionTimeout += delta;
+			// _colorRect.Color = _colorRect.Color.Lerp(new Color(0, 0, 0, 255), (float)_transitionTimeout/2);
+			_colorRect.Color = new Color(0, 0, 0, Mathf.Lerp(0, 1, (float)_transitionTimeout/2));
+			_music.VolumeDb = Mathf.Lerp(0, -41, (float)_transitionTimeout/2);
+			if (_music.VolumeDb < -40)
+			{
+				GetNode<SceneManager>("/root/SceneManager").SwitchScene("Day1");
+			}
+		}
+	}
+
+	public override void _Input(InputEvent @event)
+	{
+		if (@event.IsActionPressed("Interact"))
+		{
+			_state = State.Transition;
+		}
+	}
+}