Added final features for this release. Now only polishing (if needed) remains.

Features: Sacrifice-Node, Maintain-Node, Options for screen type, lightcolor and soundvolume, tied in sound effects, game pause when menu is open, visibly open up gate when opening it.

Scripts/UI/Common/UIHandler.cs

@@ -58,6 +58,7 @@ public partial class UIHandler : Control
 	public void HandleMenuButton()
 	{
 		OpenUIElement(menu);
+		GameData.isPaused = menu.Visible || options.Visible;
 	}
 
 	public void HandleMenu()
@@ -67,7 +68,9 @@ public partial class UIHandler : Control
 
 	public void ShowOptions()
 	{
+		menu.Hide();
 		OpenUIElement(options);
+		GameData.isPaused = options.Visible;
 	}
 
 	public void HandleMapButton()
@@ -101,6 +104,7 @@ public partial class UIHandler : Control
 		RAM.Text = memoryDisplay;
 		DisplaySurvivalStats();
 		DisplayWorldStats();
+		DisplayLoseCondition();
 	}
 
 	public void ExitGame()
@@ -123,6 +127,7 @@ public partial class UIHandler : Control
 
 	public void OpenUIElement(Control element)
 	{
+		SoundManager.PlayButton();
 		if (element.Visible)
 		{
 			element.Hide();
@@ -141,6 +146,11 @@ public partial class UIHandler : Control
 			if (child == element) continue;
 			child.Visible = false;
 		}
+
+		if (element != menu && element != options)
+		{
+			GameData.isPaused = false;
+		}
 	}
 
 	private void DisplayRobotAlarm()
@@ -201,15 +211,28 @@ public partial class UIHandler : Control
 		unlockLayer.Disabled = !GameData.inventory.CanCraft(GameData.map[GameData.lowestLayer].gateIngredients, 1);
 	}
 
+	private void DisplayLoseCondition()
+	{
+		if (!GameData.HasNoRobotRecovery()) return;
+
+		ShowGameOver("No robots remain and no robot can be spawned from inventory.");
+	}
+
 	public void UnlockLayer()
 	{
 		if (GameData.inventory.CanCraft(GameData.map[GameData.lowestLayer].gateIngredients, 1))
 		{
+			int openedLayer = GameData.lowestLayer;
 			foreach (Ingredient ingredient in GameData.map[GameData.lowestLayer].gateIngredients)
 			{
 				GameData.inventory.RemoveItem(ingredient.Item, ingredient.Amount);
 			}
 			GameData.lowestLayer++;
+			World world = GetNodeOrNull<World>("/root/Main/World");
+			if (world != null)
+			{
+				world.OpenGate(openedLayer);
+			}
 			if (GameData.lowestLayer == GameData.ruinSize)
 			{
 				gameOver.Show();
@@ -218,9 +241,14 @@ public partial class UIHandler : Control
 	}
 
 	public void ShowGameOver()
+	{
+		ShowGameOver($"You died!\rReason: {GameData.survival.deathReason}\rBetter luck next time.");
+	}
+
+	public void ShowGameOver(string message)
 	{
 		if (gameOver.Visible) return;
-		gameOver.GetNode<RichTextLabel>("./VBoxContainer/Content").Text = $"[font_size=32]You died!\rReason: {GameData.survival.deathReason}\rBetter luck next time.\r";
+		gameOver.GetNode<RichTextLabel>("./VBoxContainer/Content").Text = $"[font_size=32]{message}\r";
 		gameOver.Show();
 	}
 

Scripts/UI/DSL/CodingWindow.cs

@@ -130,6 +130,8 @@ public partial class CodingWindow : PanelContainer
 
 	public void LoadProgram(int index)
 	{
+		if (index <= 0) return;
+
 		ClearWindow();
 		string scriptContent = FileHandler.LoadProgram(availableScripts.GetItemText(index));
 		string[] nodes = scriptContent.Split(";");
@@ -151,6 +153,22 @@ public partial class CodingWindow : PanelContainer
 		availableScripts.Select(0);
 	}
 
+	public void DeleteProgram()
+	{
+		string filename = scriptName.Text;
+		int selectedIndex = availableScripts.GetSelectedId();
+		if (selectedIndex > 0)
+		{
+			filename = availableScripts.GetItemText(selectedIndex);
+		}
+
+		if (filename.Length <= 0) return;
+		if (!FileHandler.DeleteProgram(filename)) return;
+
+		ClearWindow();
+		SetupScriptOptions();
+	}
+
 	public void SaveProgram()
 	{
 		string result = "";

Scripts/UI/DSL/NodeDisplay.cs

@@ -89,6 +89,14 @@ public partial class NodeDisplay : PanelContainer
 				result.node = new ElseNode();
 				result.LoadElse(nodeSanitized);
 				break;
+			case "maintain":
+				result.node = new MaintainNode();
+				result.LoadMaintain(nodeSanitized);
+				break;
+			case "sacrifice":
+				result.node = new SacrificeNode();
+				result.LoadSacrifice(nodeSanitized);
+				break;
 			default:
 				result.QueueFree();
 				return null;
@@ -99,6 +107,10 @@ public partial class NodeDisplay : PanelContainer
 
 	private void LoadElse(string content) { }
 
+	private void LoadMaintain(string content) { }
+
+	private void LoadSacrifice(string content) { }
+
 	private void LoadIf(string content)
 	{
 		HBoxContainer valueContainer = GetNode<HBoxContainer>("./EditorDisplay/VBoxContainer/Values");

Scripts/UI/Menus/MainMenu.cs

@@ -2,6 +2,8 @@ using Godot;
 
 public partial class MainMenu : Control
 {
+	[Export] private PanelContainer options;
+
 	public override void _Ready()
 	{
 		UIStyle.Apply(this);
@@ -26,4 +28,11 @@ public partial class MainMenu : Control
 	{
 		GetTree().Quit();
 	}
+
+	public void OnOptionsPressed()
+	{
+		if (options == null) return;
+
+		options.Show();
+	}
 }

Scripts/UI/Menus/OptionsMenu.cs

@@ -0,0 +1,83 @@
+using Godot;
+
+public partial class OptionsMenu : PanelContainer
+{
+    private readonly Vector2 panelSize = new Vector2(420, 260);
+
+    [Export] private OptionButton screenMode;
+    [Export] private HSlider soundVolume;
+    [Export] private ColorPickerButton lightColor;
+
+    public override void _Ready()
+    {
+        CenterPanel();
+        SetupScreenModes();
+        screenMode.Select(GameData.screenMode);
+        soundVolume.Value = GameData.soundVolume * 100f;
+        lightColor.Color = GameData.lightColor;
+        ApplyScreenMode(GameData.screenMode);
+        SoundManager.SetMasterVolume(GameData.soundVolume);
+    }
+
+    private void SetupScreenModes()
+    {
+        screenMode.Clear();
+        screenMode.AddItem("Fullscreen");
+        screenMode.AddItem("Windowed");
+        screenMode.AddItem("Windowed Fullscreen");
+        screenMode.Select(2);
+    }
+
+    public void OnScreenModeSelected(int index)
+    {
+        GameData.screenMode = index;
+        ApplyScreenMode(index);
+    }
+
+    private void ApplyScreenMode(int index)
+    {
+        switch (index)
+        {
+            case 0:
+                DisplayServer.WindowSetMode(DisplayServer.WindowMode.Fullscreen);
+                DisplayServer.WindowSetFlag(DisplayServer.WindowFlags.Borderless, false);
+                break;
+            case 1:
+                DisplayServer.WindowSetMode(DisplayServer.WindowMode.Windowed);
+                DisplayServer.WindowSetFlag(DisplayServer.WindowFlags.Borderless, false);
+                break;
+            case 2:
+                DisplayServer.WindowSetMode(DisplayServer.WindowMode.Fullscreen);
+                DisplayServer.WindowSetFlag(DisplayServer.WindowFlags.Borderless, true);
+                break;
+        }
+    }
+
+    public void OnSoundVolumeChanged(double value)
+    {
+        GameData.soundVolume = (float)value / 100f;
+        SoundManager.SetMasterVolume(GameData.soundVolume);
+    }
+
+    public void OnLightColorChanged(Color color)
+    {
+        GameData.lightColor = color;
+        LightHandler.RedrawLights(color);
+    }
+
+    public void CloseOptions()
+    {
+        Hide();
+        GameData.isPaused = false;
+    }
+
+    private void CenterPanel()
+    {
+        CustomMinimumSize = panelSize;
+        SetAnchorsPreset(LayoutPreset.Center);
+        OffsetLeft = -panelSize.X / 2f;
+        OffsetTop = -panelSize.Y / 2f;
+        OffsetRight = panelSize.X / 2f;
+        OffsetBottom = panelSize.Y / 2f;
+    }
+}

Scripts/UI/Menus/OptionsMenu.cs.uid

@@ -0,0 +1 @@
+uid://ca1rfge0y3y4i