now it's actually playable

scripts/GameManager.cs

@@ -8,11 +8,17 @@ public partial class GameManager : Node
 		public ulong GameStart = 0;
 		public ulong GameEnd = 0;
 		public int Attempts = 0;
-		public Node2D Checkpoint;
+		public NodePath Checkpoint = new NodePath();
 
-		public GameInfo(Node2D checkpoint)
+		public GameInfo(NodePath path)
 		{
-			Checkpoint = checkpoint;
+			SetCheckpoint(path);
+		}
+
+		public void SetCheckpoint(NodePath path)
+		{
+			GD.Print($"{path}");
+			Checkpoint = path;
 		}
 	}
 
@@ -30,8 +36,9 @@ public partial class GameManager : Node
 	{
 		if (!IsPlaying)
 		{
+			GD.Print("Restart stats");
 			IsPlaying = true;
-			_gameInfo = new GameInfo(FirstZone.PlayerSpawnPoint);
+			_gameInfo = new GameInfo(GetPathTo(FirstZone.PlayerSpawnPoint));
 		}
 
 		StartGame();
@@ -40,18 +47,21 @@ public partial class GameManager : Node
 	public void StartGame()
 	{
 		_gameInfo.GameStart = Time.GetTicksMsec();
-		Player.Position = _gameInfo.Checkpoint.GlobalPosition;
+		Player.GlobalPosition = GetNode<Node2D>(_gameInfo.Checkpoint).GlobalPosition;
 	}
 
 	public void EndGame()
 	{
 		_gameInfo.GameEnd = Time.GetTicksMsec();
 
+		Player.Invincible = true;
+		Player.SetProcess(false);
+
 		EmitSignal(SignalName.GameOver);
 	}
 
 	public string GetFormattedTimeElapsed() =>
-		TimeSpan.FromMilliseconds(_gameInfo.GameEnd - _gameInfo.GameStart).ToString(@"hh\:mm\:ss.fff");
+		TimeSpan.FromMilliseconds(_gameInfo.GameEnd - _gameInfo.GameStart).ToString(@"hh\:mm\:ss\.fff");
 
 	public void OnPlayerDied() => _gameInfo.Attempts++;
 
@@ -60,6 +70,7 @@ public partial class GameManager : Node
 	public void SetCurrentZone(PlayZone zone)
 	{
 		GD.Print($"New zone {zone}");
-		_gameInfo.Checkpoint = zone.PlayerSpawnPoint;
+		var path = GetPathTo(zone.PlayerSpawnPoint);
+		_gameInfo.SetCheckpoint(path);
 	}
 }

scripts/PlayZone.cs

@@ -16,9 +16,12 @@ public partial class PlayZone : Node2D
 
 	private Area2D _area2D;
 	private CollisionShape2D _collisionShape2D;
+	//private GameManager _gameManager;
 
 	public override void _Ready()
 	{
+		//_gameManager = (GameManager)GetTree().Root.FindChild("GameManager");
+		
 		_area2D = (Area2D)FindChild("Area2D");
 		_collisionShape2D = (CollisionShape2D)FindChild("CollisionShape2D");
 

scripts/Player.cs

@@ -8,6 +8,7 @@ public partial class Player : CharacterBody2D
 	public delegate void KilledEventHandler();
 
 	public bool Alive = true;
+	public bool Invincible = false;
 
 	public static Player Instance { get; private set; }
 	
@@ -65,7 +66,7 @@ public partial class Player : CharacterBody2D
 
 	public void Kill(Node2D killer)
 	{
-		if (!Alive)
+		if (!Alive || Invincible)
 			return;
 		
 		GD.Print($"Killed by {killer.Name}");

scripts/WinScreen.cs

@@ -4,6 +4,7 @@ using System;
 public partial class WinScreen : TextureRect
 {
 	[Export] public GameManager Manager;
+	[Export] public Label TextLabel;
 	
 	public override void _Ready()
 	{
@@ -14,7 +15,7 @@ public partial class WinScreen : TextureRect
 	{
 		Visible = true;
 
-		((Label)FindChild("Label2")).Text =
+		TextLabel.Text =
 			$"It took you\n{Manager.GetAttempts()} attempts\nand {Manager.GetFormattedTimeElapsed()}\nto finish the game.";
 	}
 

scripts/entities/And.cs

@@ -15,13 +15,15 @@ public partial class And : Node
 	public void Increment()
 	{
 		_buttons++;
+		GD.Print($"Increment {_buttons}/{CountOfButtons}");
 		if (_buttons == CountOfButtons)
-			EmitSignal(SignalName.ConditionNotMet);
+			EmitSignal(SignalName.ConditionMet);
 	}
 
 	public void Decrement()
 	{
 		_buttons--;
+		GD.Print($"Decrement {_buttons}/{CountOfButtons}");
 		if (_buttons != CountOfButtons)
 			EmitSignal(SignalName.ConditionNotMet);
 	}

scripts/entities/Door.cs

@@ -3,12 +3,18 @@ using Godot;
 public partial class Door : Node2D
 {
 	private AnimatedSprite2D _animatedSprite2D;
-	private CollisionShape2D _collisionShape2D;
+	private StaticBody2D _staticBody2D;
+
+	private uint _collisionMask;
+	private uint _collisionLayer;
 	
 	public override void _Ready()
 	{
 		_animatedSprite2D = (AnimatedSprite2D)FindChild("AnimatedSprite2D");
-		_collisionShape2D = (CollisionShape2D)FindChild("CollisionShape2D");
+		_staticBody2D = (StaticBody2D)FindChild("StaticBody2D");
+
+		_collisionMask = _staticBody2D.CollisionMask;
+		_collisionLayer = _staticBody2D.CollisionLayer;
 
 		Close();
 	}
@@ -16,12 +22,16 @@ public partial class Door : Node2D
 	public void Close()
 	{
 		_animatedSprite2D.Play("close");
-		_collisionShape2D.Disabled = false;
+
+		_staticBody2D.CollisionMask = _collisionMask;
+		_staticBody2D.CollisionLayer = _collisionLayer;
 	}
 
 	public void Open()
 	{
 		_animatedSprite2D.Play("open");
-		_collisionShape2D.Disabled = true;
+
+		_staticBody2D.CollisionMask = 0;
+		_staticBody2D.CollisionLayer = 0;
 	}
 }