Camera가 GameObject 따라가도록 하기.

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

// Player에 카메라가 따라가도록 함.
public class CameraFollow : MonoBehaviour
{
    [SerializeField]
    private Transform targetToFollow; // 따라갈 target. (Player)

    private void Update()
    {
        transform.position = new Vector3(
            transform.position.x, // 나의 x pos
            targetToFollow.position.y, // Player의 y pos
            transform.position.z);
    }
}

스크립트를 camera에 attach