Added a pause-menu

Assets/Scripts/UI/MainMenu.cs

@@ -27,6 +27,9 @@ public class MainMenu : MonoBehaviour
 
         m_ControlsCanvas.enabled = false;
         m_OptionsCanvas.enabled = false;
+
+        Cursor.visible = true;
+        Cursor.lockState = CursorLockMode.Confined;
     }
 
     public void StartGame() => SceneManager.LoadScene(1);
@@ -55,7 +58,7 @@ public class MainMenu : MonoBehaviour
 
     private void Update()
     {
-        if (Input.GetKey(KeyCode.Escape))
+        if (Input.GetKey(KeyCode.Tab))
         {
             StartMenu();
         }

Assets/Scripts/UI/PauseMenu.cs

@@ -0,0 +1,46 @@
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public class PauseMenu : MonoBehaviour
+{
+    [SerializeField] Canvas m_Canvas;
+
+    private bool m_Paused = false;
+
+    private void UpdateState()
+    {
+        m_Canvas.enabled = m_Paused;
+        Time.timeScale = m_Paused ? 0.0f : 1.0f;
+
+        Cursor.visible = m_Paused;
+        Cursor.lockState = m_Paused ? CursorLockMode.None : CursorLockMode.Locked;
+    }
+
+    private void Start()
+    {
+        UpdateState();
+    }
+
+    private void Update()
+    {
+        // Toggles the paused state if the ESC key is pressed //
+        if (Input.GetKeyDown(KeyCode.Tab) && PlayerMovement.Instance().IsDead() == false)
+        {
+            m_Paused = !m_Paused;
+
+            UpdateState();
+        }
+    }
+
+    public void Unpause()
+    {
+        m_Paused = false;
+        UpdateState();
+    }
+
+    public void MainMenu()
+    {
+        Time.timeScale = 1.0f;
+        SceneManager.LoadScene(0);
+    }
+}

Assets/Scripts/UI/PauseMenu.cs.meta

@@ -0,0 +1,11 @@
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