60.#3

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

public class BlockController : MonoBehaviour
{
    // 落下タイマー
    float fallTimerMax = 0.5f;
    float fallTimer;

    // Start is called before the first frame update
    void Start()
    {
        fallTimer = fallTimerMax;
    }

    // Update is called once per frame
    void Update()
    {
        // 落下タイマー消化
        fallTimer -= Time.deltaTime;

        // 移動する方向
        Vector3 movePosition = Vector3.zero;

        // 左移動
        if(Input.GetKeyUp(KeyCode.LeftArrow))
        {
            movePosition = Vector3.left;
        }
        // 右移動
        else if (Input.GetKeyUp(KeyCode.RightArrow))
        {
            movePosition = Vector3.right;
        }
        // 下移動
        else if (Input.GetKeyUp(KeyCode.DownArrow))
        {
            movePosition = Vector3.down;
        }
        // 回転
        else if (Input.GetKeyUp(KeyCode.UpArrow))
        {
            transform.Rotate(new Vector3(0, 0, 1), 90);
        }

        // 時間経過で下移動
        if(fallTimer < 0)
        {
            movePosition = Vector3.down;
            fallTimer = fallTimerMax;
        }

        // 移動
        transform.position += movePosition;
    }
}