unity-atoms/UnityAtomsTestsAndExamples/Assets/Examples/Intro/Scripts/PlayerMove.cs

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

public class PlayerMove : MonoBehaviour
{
    float horizontal = 0f;
    float vertical = 0f;

    void Update()
    {
        horizontal = Input.GetAxis("Horizontal");
        vertical = Input.GetAxis("Vertical");
    }

    void FixedUpdate()
    {
        GetComponent<Rigidbody2D>().velocity = new Vector2(horizontal, vertical) * 5f;
    }
}