Level Selection related stuff added

Assets/Scripts/UI/LevelButton.cs

@@ -0,0 +1,16 @@
+using Level;
+using TMPro;
+using UnityEngine;
+
+namespace UI
+{
+    public class LevelButton : MonoBehaviour
+    {
+        private TMP_Text text = null;
+
+        private void Awake() => text = GetComponentInChildren<TMP_Text>();
+
+        public void SetLevel(string levelName) => text.text = levelName;
+        public void StartLevel() => LevelManager.Instance.SwitchToLevel(text.text);
+    }
+}

Assets/Scripts/UI/LevelButton.cs.meta

@@ -0,0 +1,11 @@
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+guid: 159a88a420256634c8758e2b1501c29a
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
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+  assetBundleVariant: 

Assets/Scripts/UI/LevelSelectionMenu.cs

@@ -0,0 +1,55 @@
+using System;
+using Level;
+using UnityEngine;
+
+namespace UI
+{
+    public class LevelSelectionMenu : MonoBehaviour
+    {
+        [SerializeField] private Vector2Int maxGridSize = Vector2Int.one;
+        private GameObject levelButtonPrefab = null;
+
+        private void Awake()
+        {
+            levelButtonPrefab = Resources.Load<GameObject>("UI/Level Button Variant");
+        }
+
+        private void Start()
+        {
+            LevelButton instance = null;
+
+            int rowIndex = 0;
+            int columnIndex = 0;
+            int i = 0;
+            int count = LevelManager.Instance.Levels.Values.Count;
+
+            RectTransform rectTransform = levelButtonPrefab.transform.GetComponent<RectTransform>();
+            float rowOffset = (int)(count / maxGridSize.x) * rectTransform.rect.height * 0.75f;
+            float columnOffset = -maxGridSize.x * rectTransform.rect.width * 0.75f;
+            if (maxGridSize.x % 2 == 1)
+                columnOffset += rectTransform.rect.width * 0.75f;
+
+            RectTransform instanceRectTransform = null;
+            Vector3 instancePosition = Vector3.zero;
+            foreach (var level in LevelManager.Instance.Levels.Values)
+            {
+                if (i > maxGridSize.x * maxGridSize.y)
+                    break;
+
+
+                rowIndex = i / maxGridSize.x;
+                columnIndex = i % maxGridSize.x;
+
+                instance = Instantiate(levelButtonPrefab, transform.position, Quaternion.identity, transform).GetComponent<LevelButton>();
+                instance.SetLevel(level.name);
+                instanceRectTransform = instance.transform.GetComponent<RectTransform>();
+
+                instancePosition.y = rowOffset - rowIndex * instanceRectTransform.rect.height * 1.5f;
+                instancePosition.x = columnOffset + columnIndex * instanceRectTransform.rect.width * 1.5f;
+                instanceRectTransform.localPosition = instancePosition;
+
+                i++;
+            }
+        }
+    }
+}

Assets/Scripts/UI/LevelSelectionMenu.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/UI/UIManager.cs

@@ -29,6 +29,8 @@ namespace UI
 
         public void CloseAllCanvases()
         {
+            Initialize();
+
             foreach (Canvas canvas in canvases.Values)
                 canvas.gameObject.SetActive(false);
         }