CubeTransformer.cs

using System;
using UnityEngine;
using Random = UnityEngine.Random;

public class CubeTransformer : MonoBehaviour
{
    [SerializeField] private Vector3 minInitialPosition;
    [SerializeField] private Vector3 maxInitialPosition;
    [SerializeField] private Vector2 heightRange = new Vector2(-5, 5);
    [SerializeField] private Vector2 rotationSpeedRange = new Vector2(-60, 60);

    [SerializeField] private Vector3 scaleRange = Vector3.one;
    
    private Vector3 _initialPosition;
    private Vector3 _initialRotation;
    private Vector3 _initialScale;
    private float _rotationSpeed;

    private float _currentMoveTime = 0;
    private float _scaleTime;

    private void Awake()
    {
        _initialPosition = new Vector3(
            Random.Range(minInitialPosition.x, maxInitialPosition.x),
            Random.Range(minInitialPosition.y, maxInitialPosition.y),
            Random.Range(minInitialPosition.z, maxInitialPosition.z)
        );
        
        _initialRotation = new Vector3(
            Random.Range(rotationSpeedRange.x, rotationSpeedRange.y),
            Random.Range(rotationSpeedRange.x, rotationSpeedRange.y),
            Random.Range(rotationSpeedRange.x, rotationSpeedRange.y)
        );

        _initialScale = new Vector3(
            1 + Random.Range(scaleRange.x, scaleRange.y),
            1 + Random.Range(scaleRange.x, scaleRange.y),
            1 + Random.Range(scaleRange.x, scaleRange.y)
        );
        
        transform.position = _initialPosition;
        transform.rotation = Quaternion.Euler(_initialRotation);
        transform.localScale = _initialScale;
        _rotationSpeed = Random.Range(rotationSpeedRange.x, rotationSpeedRange.y);
        _currentMoveTime = Random.Range(0f, 10f);
        _scaleTime = Random.Range(0.5f, 2f);
    }

    private void Update()
    {
        _currentMoveTime += Time.deltaTime;
        
        var height = Mathf.Lerp(heightRange.x, heightRange.y, Mathf.PingPong(_currentMoveTime, 1));
        
        transform.position = new Vector3(
            transform.position.x,
            height,
            transform.position.z
        );
        
        transform.Rotate(_initialRotation * (_rotationSpeed * Time.deltaTime));
        
        transform.localScale = _initialScale * Mathf.PingPong(_currentMoveTime, _scaleTime);
    }
}