i added ai playtesting feedback to my unity prototype and it found things my human playtesters completely missed

// GameplayEventLogger.cs
// Attach to a persistent GameObject in your scene
// Logs gameplay events to JSON for AI analysis

using System.Collections.Generic;
using System.IO;
using UnityEngine;

[System.Serializable]
public class GameplayEvent
{
    public string eventType;      // e.g. "mechanic_used", "player_death", "area_entered"
    public string detail;         // e.g. "shield", "zone_b", "health_pickup_ignored"
    public float sessionTime;     // seconds since session start
    public Vector2 position;      // world position when event occurred
}

[System.Serializable]
public class SessionLog
{
    public string sessionId;
    public string gameVersion;
    public float totalSessionTime;
    public List<GameplayEvent> events = new List<GameplayEvent>();
}

public class GameplayEventLogger : MonoBehaviour
{
    public static GameplayEventLogger Instance;

    private SessionLog currentSession;
    private float sessionStartTime;

    // Set these in Inspector
    public string gameVersion = "0.3.1";
    public bool loggingEnabled = true; // Disable for release builds

    void Awake()
    {
        if (Instance != null) { Destroy(gameObject); return; }
        Instance = this;
        DontDestroyOnLoad(gameObject);
        InitSession();
    }

    void InitSession()
    {
        currentSession = new SessionLog
        {
            sessionId = System.Guid.NewGuid().ToString()[..8],
            gameVersion = gameVersion
        };
        sessionStartTime = Time.time;
    }

    // Call this from anywhere in your game code
    // Examples:
    // GameplayEventLogger.Instance.Log("mechanic_used", "shield", transform.position);
    // GameplayEventLogger.Instance.Log("player_death", "fall_damage", transform.position);
    // GameplayEventLogger.Instance.Log("item_ignored", "health_potion", item.position);
    public void Log(string eventType, string detail, Vector2 position = default)
    {
        if (!loggingEnabled) return;

        currentSession.events.Add(new GameplayEvent
        {
            eventType = eventType,
            detail = detail,
            sessionTime = Time.time - sessionStartTime,
            position = position
        });
    }

    // Call this when the player ends a session or closes the game
    public void SaveSession()
    {
        currentSession.totalSessionTime = Time.time - sessionStartTime;
        string json = JsonUtility.ToJson(currentSession, true);
        string path = Path.Combine(Application.persistentDataPath,
            $"session_{currentSession.sessionId}.json");
        File.WriteAllText(path, json);
        Debug.Log($"Session saved to: {path}");
    }

    void OnApplicationQuit()
    {
        SaveSession();
    }
}

// To log a mechanic use from the shield controller:
// void Update() {
//     if (Input.GetKeyDown(KeyCode.Space)) {
//         GameplayEventLogger.Instance.Log(
//             "mechanic_used", "shield",
//             new Vector2(transform.position.x, transform.position.y));
//     }
// }

# The GPT-4o prompt I use after each playtest session
# I paste the session JSON directly into this prompt

---
You are a game design analyst reviewing a playtest session log
for a 2D action RPG prototype.

Game mechanics available to the player:
- Basic attack (space bar)
- Shield block (left shift)
- Dash (Q)
- Ranged attack (E, limited uses)
- Health pickup (walk over)

Level areas: Entry Zone, Forest Path, Combat Arena, Boss Approach

Here is the session event log:
[PASTE SESSION JSON HERE]

Please analyse this session and tell me:

1. Which mechanics did the player NOT use that they had available?
   Flag any mechanic that was used less than twice in a session
   longer than 5 minutes.

2. Were there any points where the player appeared to be confused
   or stuck? Look for: same area revisited three or more times,
   long gaps between events, deaths in the same location repeatedly.

3. What did the player spend the most time on?
   Is this time allocation intentional based on game design goals?

4. Are there any items or pickups the player consistently ignored?
   What might explain this behavior?

5. One hypothesis about a design change that could improve
   engagement based only on this session data.

Be specific and data driven. Reference exact timestamps and
event counts where relevant. Do not pad the response with
general game design advice.
---

# After 4 or more sessions I use Claude Pro to synthesise patterns:
---
Here are analysis summaries from 6 playtest sessions of my prototype.
Each summary was generated from gameplay event logs.

[PASTE 6 SESSION SUMMARIES HERE]

Look across all 6 sessions and identify:
1. Behaviors that appear in 4 or more sessions (consistent patterns)
2. Mechanics that are being underused across sessions
3. The one design change that would address the most common issue
   across multiple sessions

Be specific. Cite which sessions show each pattern.
---