Added navigation to main menu options

Scripts/UI/DebugMenu.cs

@@ -16,10 +16,15 @@ public partial class DebugMenu : MenuBase
 
 	[Export]
 	public Container ButtonsContainer { get; private set; }
+	
+	[Export]
+	public Button DefaultSelectedButton { get; private set; }
 
 	// Called when the node enters the scene tree for the first time.
 	public override void _Ready()
 	{
+		DefaultSelectedButton.GrabFocus();
+		
 		foreach (var level in Levels.Maps)
 		{
 			if (!level.Enabled) continue;