Cleaned up project with better structure.

Scripts/UI/Common/Camera3d.cs

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+using Godot;
+using static GameData;
+
+public partial class Camera3d : Camera3D
+{
+	[Export] public float Speed = 7.5f;
+	[Export] public float MouseSensitivity = 0.2f;
+	[Export] public float ScrollStrength = 5.0f;
+
+	public override void _Ready()
+	{
+		Position = new Vector3(0, 0, tileWidth / 2);
+	}
+
+	public override void _Process(double delta)
+	{
+		if (canMove) MoveCamera(delta);
+	}
+
+	public void MoveCamera(double delta)
+	{
+		float d = (float)delta;
+
+		Vector3 rotation = RotationDegrees;
+		rotation.X = Mathf.Clamp(rotation.X, -90f, 90f);
+		RotationDegrees = rotation;
+
+		Vector3 direction = Vector3.Zero;
+		if (Input.IsActionPressed("move_forward") && Position.Z > 0) direction += Transform.Basis.Z;
+		if (Input.IsActionPressed("move_backward") && Position.Z < layerSize * 6) direction -= Transform.Basis.Z;
+		if (Input.IsActionPressed("move_left") && Position.X > 0) direction -= Transform.Basis.X;
+		if (Input.IsActionPressed("move_right") && Position.X < layerSize * 6) direction += Transform.Basis.X;
+
+		if (direction != Vector3.Zero)
+		{
+			direction = direction.Normalized() * Speed * (Input.IsActionPressed("sprint") ? 2.5f : 1) * d;
+			Translate(direction);
+		}
+
+		if (Position.Y != 10 - visibleLayer * 4)
+		{
+			Position = new Vector3(Position.X, 10 - visibleLayer * 4, Position.Z);
+		}
+	}
+}

Scripts/UI/Common/Camera3d.cs.uid

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+uid://c7khr6oist3ku

Scripts/UI/Common/UIHandler.cs

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+using System;
+using System.Diagnostics;
+using Godot;
+
+public partial class UIHandler : Control
+{
+	[Export] CodingWindow codingWindow;
+	[Export] RobotList robotList;
+	[Export] Camera3D mainCam;
+	[Export] Map map;
+	[Export] RichTextLabel FPS;
+	[Export] RichTextLabel RAM;
+	[Export] PanelContainer options;
+	[Export] Control uiContent;
+	[Export] PanelContainer menu;
+	[Export] PanelContainer inventory;
+	[Export] ResearchList researchList;
+	[Export] TextureRect robotAlarm;
+
+	private bool receivedRobotJumpSignal = false;
+	public override void _Ready()
+	{
+		robotList.OnRobotJumpTo += OnRobotJumpTo;
+	}
+
+	public override void _ExitTree()
+	{
+		robotList.OnRobotJumpTo -= OnRobotJumpTo;
+	}
+
+	public override void _Process(double delta)
+	{
+		DisplayStats();
+		DisplayRobotAlarm();
+
+		Control focused = GetViewport().GuiGetFocusOwner();
+
+		if (focused is LineEdit || focused is TextEdit)
+			return;
+
+		if (Input.IsActionJustPressed("map")) HandleMapButton();
+		if (Input.IsActionJustPressed("menu")) HandleMenuButton();
+		if (Input.IsActionJustPressed("robot_list")) HandleRobotListButton();
+		if (Input.IsActionJustPressed("inventory")) HandleInventoryButton();
+		if (Input.IsActionJustPressed("research")) HandleResearchButton();
+	}
+
+	public void HandleMenuButton()
+	{
+		OpenUIElement(menu);
+	}
+
+	public void HandleMenu()
+	{
+		HandleMenuButton();
+	}
+
+	public void ShowOptions()
+	{
+		OpenUIElement(options);
+	}
+
+	public void HandleMapButton()
+	{
+		OpenUIElement(map);
+		if (map.Visible) map.ShowMap();
+	}
+
+	public void HandleRobotListButton()
+	{
+		receivedRobotJumpSignal = false;
+		OpenUIElement(robotList);
+	}
+
+	public void HandleInventoryButton()
+	{
+		OpenUIElement(inventory);
+	}
+
+	public void HandleResearchButton()
+	{
+		OpenUIElement(researchList);
+		if (researchList.Visible) researchList.SetupGraph();
+	}
+
+	public void DisplayStats()
+	{
+		FPS.Text = Engine.GetFramesPerSecond().ToString() + " FPS";
+		double memory = Process.GetCurrentProcess().WorkingSet64 / (1024 * 1024);
+		string memoryDisplay = memory > 1024 ? Math.Round(memory / 1024, 2).ToString() + " GB" : memory.ToString() + " MB";
+		RAM.Text = memoryDisplay;
+	}
+
+	public void ExitGame()
+	{
+		GetTree().ChangeSceneToFile("res://Scenes/MainMenu.tscn");
+	}
+
+	public void OpenUIElement(Control element)
+	{
+		if (element.Visible)
+		{
+			element.Hide();
+		}
+		else
+		{
+			element.Show();
+		}
+		HideUIElements(element);
+	}
+
+	private void HideUIElements(Control element)
+	{
+		foreach (PanelContainer child in uiContent.GetChildren())
+		{
+			if (child == element) continue;
+			child.Visible = false;
+		}
+	}
+
+	private void DisplayRobotAlarm()
+	{
+		string messages = "";
+		foreach (Robot robot in GameData.robots)
+		{
+			if (robot.currentMessage.Length > 0)
+			{
+				messages += $"{robot.Name}: {robot.currentMessage}\r";
+			}
+		}
+		robotAlarm.Visible = messages.Length > 0;
+		robotAlarm.TooltipText = messages;
+	}
+
+	private void OnRobotJumpTo(Robot robot)
+	{
+		if (receivedRobotJumpSignal) return;
+
+		receivedRobotJumpSignal = true;
+		mainCam.Position = new Vector3(robot.Position.X, mainCam.Position.Y, robot.Position.Z + 3f);
+		codingWindow.SetRobot(robot);
+		OpenUIElement(codingWindow);
+	}
+}

Scripts/UI/Common/UIHandler.cs.uid

@@ -0,0 +1 @@
+uid://bm7knir4552j5