Unity 2D Character controller bug problem

Hi I have a problem with this script,the script is not bad but there are a bug where if you press A + Space and after D or the reverse,the player increases the speed, and does not change direction,please someone that help to solve this problem? The code:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. public class CharacterController2D : MonoBehaviour {
4.      public float upSpead;
5.      public float jumpSpead;
6.      public bool jumping = false;
7.      public bool grounded = false;
8.      public string sidesHit = "none";
9.      public Vector2 down;
10.      public Vector2 sides;
11.      public Vector2 sideLeft;
12.      public float skinWidth = 0.1f;
13.      public float InitalAcceleration = 500;
14.      public float airspeed = 500;
15.      public bool maxSpeed = false;
16.      Vector2 start;
17.      RaycastHit2D hit;
18.      void Start(){
19.          //start = transform.position;
20.          //start.y = transform.position.y - transform.localScale.y/2f;
21.          }
22.      void Update () {
23.      //Basic ground checking code with Physics2d raycasting
24.          sideLeft = transform.position;
25.          sideLeft.x = transform.position.x - transform.localScale.x / 2 - 0.1f;
26.          sides = transform.position;
27.          sides.x = transform.position.x + transform.localScale.x / 2 + 0.1f;
28.          start = transform.position;
29.          start.y = transform.position.y - transform.localScale.y/2f - 0.1f;
30.          Debug.DrawRay (start, -Vector2.up);
31.          Debug.DrawRay (new Vector2(start.x - transform.localScale.x/2, start.y), -Vector2.up);
32.          Debug.DrawRay (new Vector2(start.x + transform.localScale.x/2, start.y), -Vector2.up);
33.          Debug.DrawRay (sides, Vector2.right);
34.          Debug.DrawRay (sideLeft, -Vector2.right);
35.          if (Physics2D.Raycast (start, -Vector2.up, skinWidth).collider != null || Physics2D.Raycast (new Vector2(start.x + transform.localScale.x/2, start.y), -Vector2.up, skinWidth).collider != null || Physics2D.Raycast (new Vector2(start.x - transform.localScale.x/2, start.y), -Vector2.up, skinWidth).collider != null) {
36.                          grounded = true;
37.                  } else {
38.              grounded = false;
39.                  }
40.    
41.          if (Input.GetKeyUp(KeyCode.A) && grounded == true) {
42.              //Detect when certain keys are released to reset velocity
43.              //Reset the velocity to a number close to 0 to make a sudden stop, but ease out to fell smoother
44.              rigidbody2D.velocity = new Vector2(-2,0);
45.          }
46.          if (Input.GetKeyUp(KeyCode.D) && grounded == true) {
47.              rigidbody2D.velocity = new Vector2(2,0);
48.          }
49.          //Jumping Trigger
50.          if (Input.GetKeyDown (KeyCode.Space)) {
51.              if(grounded == true){
52.              jumping = true;
53.                  //Add the Initial Accleration to make the player shoot up, and then slow down, then fall
54.                  rigidbody2D.AddForce(new Vector2(0,InitalAcceleration));
55.              }
56.                  }
57.          if (Input.GetKeyUp (KeyCode.Space)) {
58.              jumping = false;
59.          }
60.          if (Input.GetKey (KeyCode.Space)) {
61.              if(jumping ==true){
62.                  //Detect if speed limit is reached, and then fall back down
63.              if(rigidbody2D.velocity.y >=10){
64.                  jumping = false;
65.                  }
66.                  rigidbody2D.AddForce(new Vector2(0,jumpSpead * Time.deltaTime));
67.                  }
68.              }
69.          //Detect sides by raycastting. Possibly can be used for wall jumping
70.          if (Physics2D.Raycast (sides, Vector2.right, skinWidth).collider != null) {
71.                          sidesHit = "right";
72.          } else if (Physics2D.Raycast (sideLeft, -Vector2.right, skinWidth).collider != null) {
73.              sidesHit = "left";
74.                  }
75.              else {
76.              sidesHit = "none";
77.            
78.          }
79.          Move ();
80.      }
81.      void Move(){
82.          //Move in air code
83.          if (Input.GetAxisRaw ("Horizontal") < 0 && grounded == false && maxSpeed == true) {
84.              rigidbody2D.AddForce(new Vector2(airspeed * Time.deltaTime,0));
85.                  }
86.          else if (Input.GetAxisRaw ("Horizontal") > 0 && grounded == false && maxSpeed == true) {
87.              rigidbody2D.AddForce(new Vector2(-airspeed * Time.deltaTime,0));
88.          }
89.          //Move Left/Right Code
90.          if (rigidbody2D.velocity.x >= 9 || rigidbody2D.velocity.x <= -9) {
91.                          maxSpeed = true;
92.                  } else {
93.              if(maxSpeed == true){
94.                  maxSpeed = false;
95.              }
96.                  }
97.        
98.          if (Input.GetAxisRaw ("Horizontal") < 0 && sidesHit != "left") {
99.              if (maxSpeed == false && grounded == false) {
100.                  rigidbody2D.AddForce(new Vector2(-airspeed * Time.deltaTime,0));
101.                  }else if(maxSpeed == false){
102.              rigidbody2D.AddForce(new Vector2(-upSpead * Time.deltaTime,0));
103.                  }
104.              }
105.          if (Input.GetAxisRaw ("Horizontal") > 0 && sidesHit != "right") {
106.              if (maxSpeed == false && grounded == false && Input.GetAxisRaw ("Horizontal") < 0) {
107.                  rigidbody2D.AddForce(new Vector2(airspeed * Time.deltaTime,0));
108.              }else if(maxSpeed == false){
109.              rigidbody2D.AddForce(new Vector2(upSpead * Time.deltaTime,0));
110.              }
111.          }
112.      }
113. }
114.  

Download Project: https://github.com/Mimerme/SuperMeatyController2D/archive/master.zip