Added coliders to buttons, Buttons are clickable

Assets/Scripts/ButtonScript.cs

@@ -0,0 +1,15 @@
+using UnityEngine;
+
+public class ButtonScript : MonoBehaviour
+{
+    public int buttonIndex;
+    public ButtonsMinigame game;
+
+    void OnMouseDown()
+    {
+        game.OnButtonClicked(buttonIndex);
+    }
+
+   
+}
+    

Assets/Scripts/ButtonScript.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 3ddbb77eddbb18d4aa26a61ef9cdadb1

Assets/Scripts/ButtonsMinigame.cs

@@ -8,9 +8,10 @@ public class ButtonsMinigame : MonoBehaviour
     public int round = 1;
     public float glowDuration = 0.4f;
     public float gapBetween = 0.15f;
+    private int playerStep = 0;
     private List<int> sequence = new List<int>();
 
-    void Generatesequence()
+    void GenerateSequence()
     {
         sequence.Clear();
         for (int i = 0; i < round; i++)
@@ -20,7 +21,7 @@ public class ButtonsMinigame : MonoBehaviour
         }
     }
 
-    IEnumerator Playsequence()
+    IEnumerator PlaySequence()
     {
         for (int i = 0; i < sequence.Count; i++)
         {
@@ -34,8 +35,13 @@ public class ButtonsMinigame : MonoBehaviour
 
     void Start()
     {
-        Generatesequence();
-        StartCoroutine(Playsequence());
+        GenerateSequence();
+        StartCoroutine(PlaySequence());
+    }
+
+    public void OnButtonClicked(int buttonIndex)
+    {
+        Debug.Log("Clicked : " + buttonIndex);
     }
 
 }