Changing speed of object doesn't make it go any faster or slower

Unity Engine
1

Player speed doesn’t change, even when adjusting it in the script. Here’s my code:

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

public class player_movement : MonoBehaviour
{
    public float speed_ = 0.1f;
    // Start is called before the first frame update
    void Start()
    {
        transform.position = new Vector3(0f, 0f, 0f);
    }

    public Transform player;
    // Update is called once per frame
    void Update()
    {
        if (Input.GetKey("w"))
        {
            if (player.position.y <= 3.5f) //if player y is less than/equal to 3.5
            {
                transform.Translate(0f, 0.2f, 0f * speed_); //go up by 0.2
            }
        }
        if (Input.GetKey("s"))
        {
            if (player.position.y >= -4.0f) //if player y is greater than/equal to -4
            {
                transform.Translate(0f, -0.2f, 0f * speed_); //go down by 0.2
            }
        }
        if (Input.GetKey("a"))
        {
            if (player.position.x >= -0.5f)
            {
                transform.Translate(-0.2f, 0f, 0f * speed_);
            }
        }
        if (Input.GetKey("d"))
        {
            transform.Translate(0.2f, 0f, 0f * speed_);
        }
    }
}

and here’s a video demonstration

2

You’re multiplying by zero. 0 * ANYTHING will just give you 0.

3

ah. im an idiot