Wall collision when jumping in 2D demo

I downloaded Tower Bridge demo to find out how to create some 2D game basics and I used some scripts etc. But I can't achieve this effect - in demo, when you jump up and right AND you hit the wall, the player slides down to the ground. However the same doesn't happen in my game. I use simple 2D box colliders on my walls and my player controller script is following:

Code (csharp):

1. public class PlayerScript : MonoBehaviour {
2.     [HideInInspector]
3.     public bool facingRight = true;
4.  
5.     public float moveForce = 365f;
6.     public float jumpForce = 200f;
7.     public float maxSpeed = 5f;
8.  
9.     private Transform groundCheck;
10.     private bool onGround;
11.     private bool jump;
12.  
13.     void Awake() {
14.         groundCheck = transform.Find("groundCheck");
15.     }
16.  
17.     void Update() {
18.         onGround = Physics2D.Linecast(transform.position, groundCheck.position, 1 << LayerMask.NameToLayer("Ground"));
19.         if(Input.GetButtonDown("Jump")  onGround) {
20.             jump = true;
21.         }
22.     }
23.  
24.  
25.     void FixedUpdate() {
26.         float h = Input.GetAxis("Horizontal");
27.  
28.         if(h * rigidbody2D.velocity.x < maxSpeed) {
29.             rigidbody2D.AddForce(Vector2.right * h * moveForce);
30.         }
31.  
32.         if(Mathf.Abs(rigidbody2D.velocity.x) > maxSpeed) {
33.             rigidbody2D.velocity = new Vector2(Mathf.Sign(rigidbody2D.velocity.x) * maxSpeed, rigidbody2D.velocity.y);
34.         }
35.  
36.         if(jump) {
37.             rigidbody2D.AddForce(new Vector2(0, jumpForce));
38.             jump = false;
39.         }
40.  
41.         if (h > 0  !facingRight) {
42.             Flip();
43.         } else if (h < 0  facingRight) {
44.             Flip();
45.         }          
46.     }
47.    
48.     void Flip() {
49.         // Switch the way the player is labelled as facing.
50.         facingRight = !facingRight;
51.        
52.         // Multiply the player's x local scale by -1.
53.         Vector3 theScale = transform.localScale;
54.         theScale.x *= -1;
55.         transform.localScale = theScale;
56.     }
57. }

Yet the player object is sticked to the wall as long as I hold the keys down. Thank you for any advice.

 

Easy fix, just give your walls a physics material with no friction or bounce and it won't stick to the wall.

 

Thank you very much, sir!