RotationController

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

public class RotationController : MonoBehaviour {

    public float rotationSpeed;
    public Transform tower;

    Vector3 currentRotation;

    void Start () {
        currentRotation = tower.transform.eulerAngles;
    }

    void Update () {
        currentRotation.y += Input.GetAxis("Mouse X") * rotationSpeed * Time.deltaTime;
        tower.transform.eulerAngles = currentRotation;
    }
}