using UnityEngine;

public class SpawnEnemy : MonoBehaviour
{
    public Transform target; // target to follow
    public GameObject enemyPrefab; // enemy that will spawn
    public float speed = 1f; // follow speed
    public float MinSpawnDistance = 10f; // Min spawn distance
    public float MaxSpawnDistance = 20f; // Max spawn distance

    void Start()
    {
        // calculate a random spawn position within the specified distance of the target
        Vector2 spawnPos = Random.insideUnitCircle * Random.Range(MinSpawnDistance, MaxSpawnDistance);
        spawnPos += (Vector2)target.position;

        // instantiate a new enemy at the calculated spawn position
        GameObject enemy = Instantiate(enemyPrefab, spawnPos, Quaternion.identity);

        // attach the FollowTarget script to the new enemy and set the target to the existing target object
        FollowTarget followScript = enemy.AddComponent<FollowTarget>();
        followScript.target = target;
        followScript.speed = speed;
    }

    void Update()
    {
    }
}

using UnityEngine;

public class FollowTarget : MonoBehaviour
{
    public Transform target; // target to follow
    public float speed = 1f; // follow speed


    void Start()
    { 
    }

    void Update()
    {
        // calculate the distance to the target
        float distance = Vector2.Distance(transform.position, target.position);

        // move towards the target at the specified speed
        transform.position = Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
    }
}