TO SQUASH: Wall thickness.

Assets/Scenes/Game.unity

@@ -2960,6 +2960,9 @@ MonoBehaviour:
   player: {fileID: 1002905792}
   gameBoardSpriteRenderer: {fileID: 297740151}
   wallPrefab: {fileID: 2746972694419659216, guid: 3fbc857440f3c649b9d49d40955db450, type: 3}
+  fallbackBarThicknessWorldUnits: 0.08
+  geometryEpsilon: 0.0001
+  wallPaddingPixelsPerSide: 2
 --- !u!1001 &2090615130
 PrefabInstance:
   m_ObjectHideFlags: 0

Assets/Scripts/Game/WorldFiller.cs

@@ -15,6 +15,9 @@ public class WorldFiller : MonoBehaviour
     [SerializeField]
     private float geometryEpsilon = 0.0001f;
 
+    [SerializeField]
+    private float wallPaddingPixelsPerSide = 1.0f;
+
     private Bounds gameBoardBounds;
 
     private Vector2?[] wallPositions;
@@ -162,10 +165,20 @@ public class WorldFiller : MonoBehaviour
                 return;
             }
 
-            ApplyWallTransform(wall.transform, wallRenderer, clampedWallRect);
+            Rect boardRect = Rect.MinMaxRect(
+                gameBoardBounds.min.x,
+                gameBoardBounds.min.y,
+                gameBoardBounds.max.x,
+                gameBoardBounds.max.y
+            );
+
+            float wallPaddingWorldUnits = PixelsToWorldUnits(wallPaddingPixelsPerSide, wallRenderer);
+            Rect paddedWallRect = ExpandRectInsideBounds(clampedWallRect, wallPaddingWorldUnits, boardRect);
+
+            ApplyWallTransform(wall.transform, wallRenderer, paddedWallRect);
             var wallBounds = wallRenderer.bounds;
 
-            UpdateFreeAreas(clampedWallRect);
+            UpdateFreeAreas(paddedWallRect);
 
             // Check if there are yummies, multipliers or the shark intersecting the spawned wall.
             // Yummies and multipliers are awarded to the player if they are intersected by the wall.
@@ -226,7 +239,7 @@ public class WorldFiller : MonoBehaviour
 
             // Let the player know that the wall has been spawned.
             int areaPercentage = boardArea > geometryEpsilon
-                ? Mathf.RoundToInt((clampedWallRect.width * clampedWallRect.height / boardArea) * 100.0f)
+                ? Mathf.RoundToInt((paddedWallRect.width * paddedWallRect.height / boardArea) * 100.0f)
                 : 0;
             player.OnWallSpawned(areaPercentage);
 
@@ -491,4 +504,42 @@ public class WorldFiller : MonoBehaviour
             && point.y >= rect.yMin - geometryEpsilon
             && point.y <= rect.yMax + geometryEpsilon;
     }
+
+    private float PixelsToWorldUnits(float pixels, SpriteRenderer referenceRenderer)
+    {
+        float pixelsPerUnit = 100.0f;
+
+        if (referenceRenderer != null && referenceRenderer.sprite != null && referenceRenderer.sprite.pixelsPerUnit > 0.0f)
+        {
+            pixelsPerUnit = referenceRenderer.sprite.pixelsPerUnit;
+        }
+        else if (gameBoardSpriteRenderer != null && gameBoardSpriteRenderer.sprite != null && gameBoardSpriteRenderer.sprite.pixelsPerUnit > 0.0f)
+        {
+            pixelsPerUnit = gameBoardSpriteRenderer.sprite.pixelsPerUnit;
+        }
+
+        return pixels / pixelsPerUnit;
+    }
+
+    private Rect ExpandRectInsideBounds(Rect rect, float padding, Rect boundsRect)
+    {
+        if (padding <= geometryEpsilon)
+        {
+            return rect;
+        }
+
+        Rect expanded = Rect.MinMaxRect(
+            rect.xMin - padding,
+            rect.yMin - padding,
+            rect.xMax + padding,
+            rect.yMax + padding
+        );
+
+        if (TryGetRectIntersection(expanded, boundsRect, out Rect clampedExpanded))
+        {
+            return clampedExpanded;
+        }
+
+        return rect;
+    }
 }