Movement 2d unity

public class PlayerMovement : MonoBehaviour
{
    public float moveSpeed;
    public float jumpHeight;

    void Start()
    {
    
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            GetComponent<Rigidbody2D>().velocity = new Vector2(GetComponent<Rigidbody2D>().velocity.x, jumpHeight);
        }

        if (Input.GetKey(KeyCode.D))
        {
            GetComponent<Rigidbody2D>().velocity = new Vector2(moveSpeed, 0);
        }

        if (Input.GetKey(KeyCode.A))
        {
            GetComponent<Rigidbody2D>().velocity = new Vector2(-moveSpeed, 0);
        }
    }
}