This tiny class will Autosave your project whenever you play your scene!

EditorSceneAutosave.cs

using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;

// Credit goes to Comp-3 Interactive, thanks for sharing the script!
// This tiny class will Autosave your project whenever you play your scene!

[InitializeOnLoad]
public class Autosave
{
    static Autosave()
    {
        EditorApplication.playModeStateChanged += SaveOnPlay;
    }
    
    private static void SaveOnPlay(PlayModeStateChange state)
    {
        if(state == PlayModeStateChange.ExitingEditMode)
        {
            Debug.Log("Auto-saving...");
            EditorSceneManager.SaveOpenScenes();
            AssetDatabase.SaveAssets();
        }
    }
}