unity exosuit movement script

using UnityEngine;
using System.Collections;

public class Movement : MonoBehaviour {
    public float maxSpeed = 5.0f;
    public float speed;
    public float speedScalar = 1.25f;
    public float decelScalar = 3.0f;
    public float gravity = 20.0f;
    public float angleSpeed = 1.05f;
    Vector3 movDirection;

    // Use this for initialization
    void Start () {
        speed = 0.0f;
        movDirection = transform.right;
    }

    // Update is called once per frame
    void Update()
    {
        //Vector3 curPos = transform.position;
        /*Movement Combinations:
         * XY - forward
         * AB - backward
         * XB - right
         * AY - left */
        if (Input.GetButton("X") && Input.GetButton("Y"))
        {
            //Acceleration handling
            if (speed > -5.0f)
            {
                speed -= speedScalar * Time.deltaTime;
            }
        }
        else if (Input.GetButton("A") && Input.GetButton("B"))
        {
            //Backward acceleration handling
            if (speed < 5.0f)
            {
                speed += speedScalar * Time.deltaTime;
            }
        }
        else
        {
            if (speed < 1.0f && speed > -1.0f)
            {
                speed = 0.0f;
            }
            else if (speed < -1.0f)
            {
                speed += decelScalar * Time.deltaTime;
            }
            else if (speed > 1.0f)
            {
                speed -= decelScalar * Time.deltaTime;
            }
        }
        if (Input.GetButton("X") && Input.GetButton("B"))
        {
            transform.rotation = transform.rotation * Quaternion.AngleAxis(angleSpeed, Vector3.forward);
        }
        if (Input.GetButton("A") && Input.GetButton("Y"))
        {
            //Turn left
            transform.rotation = transform.rotation * Quaternion.AngleAxis(angleSpeed, Vector3.back);
        }
        transform.Translate(movDirection * Time.deltaTime * speed);
    }
}