void Update()
 {
 float move = Input.GetAxis("Horizontal");
 Debug.Log("Horizontal Input: " + move);
 rb.AddForce(new Vector2(move * speed, 0f), ForceMode2D.Force);
 if (Input.GetButtonDown("Jump") && isGrounded)
 {
 Debug.Log("Jump");
 rb.AddForce(new Vector2(0f, jumpForce), ForceMode2D.Impulse);
 }
 }