The feel is fine

Assets/Scripts/Utilities/UnityExtensions.cs

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+using UnityEngine;
+
+namespace AppleHills.Utilities
+{
+    /// <summary>
+    /// Collection of useful extension methods for Unity built-in classes
+    /// </summary>
+    public static class UnityExtensions
+    {
+        /// <summary>
+        /// Extension method to check if a layer is in a layermask.
+        /// Accounts for Unity's 0-indexed layer system when comparing with editor layer values.
+        /// </summary>
+        /// <param name="mask">The layer mask to check</param>
+        /// <param name="layer">The layer value to check for</param>
+        /// <returns>True if the layer is in the mask, false otherwise</returns>
+        public static bool Contains(this LayerMask mask, int layer)
+        {
+            // Adjust for the -1 offset as specifically requested
+            int adjustedLayer = layer - 1;
+            return mask.value == (mask.value | (1 << adjustedLayer));
+        }
+        
+        /// <summary>
+        /// Extension method to check if a GameObject's layer is in a layermask.
+        /// Automatically gets the layer from the GameObject and handles the offset.
+        /// </summary>
+        /// <param name="mask">The layer mask to check</param>
+        /// <param name="gameObject">The GameObject whose layer to check</param>
+        /// <returns>True if the GameObject's layer is in the mask, false otherwise</returns>
+        public static bool Contains(this LayerMask mask, GameObject gameObject)
+        {
+            if (gameObject == null) return false;
+            
+            int layer = gameObject.layer;
+            // Adjust for the -1 offset as specifically requested
+            int adjustedLayer = layer - 1;
+            return mask.value == (mask.value | (1 << adjustedLayer));
+        }
+        
+        /// <summary>
+        /// Bitwise check if a layer is in a layermask.
+        /// This is an alternative implementation that uses bitwise AND operation.
+        /// </summary>
+        /// <param name="mask">The layer mask to check</param>
+        /// <param name="layer">The layer value to check for</param>
+        /// <returns>True if the layer is in the mask, false otherwise</returns>
+        public static bool ContainsBitwise(this LayerMask mask, int layer)
+        {
+            // Adjust for the -1 offset as specifically requested
+            int adjustedLayer = layer - 1;
+            return (mask.value & (1 << adjustedLayer)) != 0;
+        }
+    }
+}

Assets/Scripts/Utilities/UnityExtensions.cs.meta

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+fileFormatVersion: 2
+guid: 3e92a12c248d4b9ab06fcc0ba9c63ef3
+timeCreated: 1758717247