TO SQUASH:

Added eye ball

Assets/Scripts/Game/BallSpawner.cs

@@ -41,6 +41,7 @@ public class BallSpawner : MonoBehaviour
         ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
         ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
         ballQueue.Enqueue(() => SpawnBall(glassBallPrefab));
+        ballQueue.Enqueue(() => SpawnBall(eyeBallPrefab));
 
         StartCoroutine(SpawnBalls());
     }
@@ -121,7 +122,7 @@ public class BallSpawner : MonoBehaviour
             bounds = boardRenderer.bounds;
         }
 
-        const float edgeInset = 0.05f;
+        const float edgeInset = 0.1f;
         float randomX = Random.Range(bounds.min.x + edgeInset, bounds.max.x - edgeInset);
         float randomY = Random.Range(bounds.min.y + edgeInset, bounds.max.y - edgeInset);
 

Assets/Scripts/Game/Balls/EyeBall.cs

@@ -0,0 +1,46 @@
+using UnityEngine;
+
+public class EyeBall : MonoBehaviour
+{
+    private Animator animator;
+
+    public AudioClip spawnSound;
+
+    public AudioClip bounceSound;
+
+    public AudioClip hitSound;
+
+    private AudioSource audioSource;
+
+    private Vector2 speed;
+
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        audioSource = GetComponent<AudioSource>();
+        animator = GetComponent<Animator>();
+        speed = new Vector2(Random.Range(-0.05f, 0.05f), Random.Range(-0.05f, 0.05f));
+
+        audioSource.PlayOneShot(spawnSound);
+    }
+
+    // Update is called once per frame
+    void FixedUpdate()
+    {
+        AnimatorStateInfo stateInfo = animator.GetCurrentAnimatorStateInfo(0);
+
+        if (stateInfo.IsName("EyeBallMove")) {
+            transform.Translate(speed);
+        }
+    }
+
+    void OnCollisionEnter2D(Collision2D collision)
+    {
+        // EyeBall only bounces off walls, not other balls
+        if (collision.gameObject.CompareTag("Wall"))
+        {
+            ContactPoint2D contact = collision.GetContact(0);
+            speed = Vector2.Reflect(speed, contact.normal);
+        }
+    }
+}

Assets/Scripts/Game/Balls/EyeBall.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 90794e12b080d5a0eb07eec901ace3a5

Assets/Scripts/Game/Balls/NukeBall.cs

@@ -2,9 +2,7 @@ using UnityEngine;
 
 public class NukeBall : MonoBehaviour
 {
-private Animator animator;
-
-    private static float gravity = 0.5f;
+    private Animator animator;
 
     public AudioClip spawnSound;
 
@@ -28,8 +26,6 @@ private Animator animator;
 
     private float height;
 
-    private float verticalVelocity = 0.0f;
-
     private Collider2D selfCollider;
 
     private bool isBouncingToHeight = false;
@@ -80,7 +76,6 @@ private Animator animator;
                 {
                     isBouncingToHeight = false;
                     bounceTimer = 0.0f;
-                    verticalVelocity = 0.0f;
                     currentPosition.y = height;
                     UpdateFallTargetFromCurrentPosition();
                 }
@@ -137,7 +132,6 @@ private Animator animator;
                 bounceTimer = 0.0f;
                 bounceStartY = contact.point.y;
                 fallTargetY = bounceStartY;
-                verticalVelocity = 0.0f;
 
                 Vector3 currentPosition = transform.position;
                 currentPosition.y = bounceStartY;