Handle Slope 2d character

 https://github.com/Bardent/Rigidbody2D-Slopes-Unity/blob/master/Assets/Scripts/PlayerController.cs

using System.Collections;
	using System.Collections.Generic;
	using UnityEngine;
	public class PlayerController : MonoBehaviour
	{
	[SerializeField]
	private float movementSpeed;
	[SerializeField]
	private float groundCheckRadius;
	[SerializeField]
	private float jumpForce;
	[SerializeField]
	private float slopeCheckDistance;
	[SerializeField]
	private float maxSlopeAngle;
	[SerializeField]
	private Transform groundCheck;
	[SerializeField]
	private LayerMask whatIsGround;
	[SerializeField]
	private PhysicsMaterial2D noFriction;
	[SerializeField]
	private PhysicsMaterial2D fullFriction;
	private float xInput;
	private float slopeDownAngle;
	private float slopeSideAngle;
	private float lastSlopeAngle;
	private int facingDirection = 1;
	private bool isGrounded;
	private bool isOnSlope;
	private bool isJumping;
	private bool canWalkOnSlope;
	private bool canJump;
	private Vector2 newVelocity;
	private Vector2 newForce;
	private Vector2 capsuleColliderSize;
	private Vector2 slopeNormalPerp;
	private Rigidbody2D rb;
	private CapsuleCollider2D cc;
	private void Start()
	{
	rb = GetComponent<Rigidbody2D>();
	cc = GetComponent<CapsuleCollider2D>();
	capsuleColliderSize = cc.size;
	}
	private void Update()
	{
	CheckInput();
	}
	private void FixedUpdate()
	{
	CheckGround();
	SlopeCheck();
	ApplyMovement();
	}
	private void CheckInput()
	{
	xInput = Input.GetAxisRaw("Horizontal");
	if (xInput == 1 && facingDirection == -1)
	{
	Flip();
	}
	else if (xInput == -1 && facingDirection == 1)
	{
	Flip();
	}
	if (Input.GetButtonDown("Jump"))
	{
	Jump();
	}
	}
	private void CheckGround()
	{
	isGrounded = Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius, whatIsGround);
	if(rb.velocity.y <= 0.0f)
	{
	isJumping = false;
	}
	if(isGrounded && !isJumping && slopeDownAngle <= maxSlopeAngle)
	{
	canJump = true;
	}
	}
	private void SlopeCheck()
	{
	Vector2 checkPos = transform.position - (Vector3)(new Vector2(0.0f, capsuleColliderSize.y / 2));
	SlopeCheckHorizontal(checkPos);
	SlopeCheckVertical(checkPos);
	}
	private void SlopeCheckHorizontal(Vector2 checkPos)
	{
	RaycastHit2D slopeHitFront = Physics2D.Raycast(checkPos, transform.right, slopeCheckDistance, whatIsGround);
	RaycastHit2D slopeHitBack = Physics2D.Raycast(checkPos, -transform.right, slopeCheckDistance, whatIsGround);
	if (slopeHitFront)
	{
	isOnSlope = true;
	slopeSideAngle = Vector2.Angle(slopeHitFront.normal, Vector2.up);
	}
	else if (slopeHitBack)
	{
	isOnSlope = true;
	slopeSideAngle = Vector2.Angle(slopeHitBack.normal, Vector2.up);
	}
	else
	{
	slopeSideAngle = 0.0f;
	isOnSlope = false;
	}
	}
	private void SlopeCheckVertical(Vector2 checkPos)
	{
	RaycastHit2D hit = Physics2D.Raycast(checkPos, Vector2.down, slopeCheckDistance, whatIsGround);
	if (hit)
	{
	slopeNormalPerp = Vector2.Perpendicular(hit.normal).normalized;
	slopeDownAngle = Vector2.Angle(hit.normal, Vector2.up);
	if(slopeDownAngle != lastSlopeAngle)
	{
	isOnSlope = true;
	}
	lastSlopeAngle = slopeDownAngle;
	Debug.DrawRay(hit.point, slopeNormalPerp, Color.blue);
	Debug.DrawRay(hit.point, hit.normal, Color.green);
	}
	if (slopeDownAngle > maxSlopeAngle || slopeSideAngle > maxSlopeAngle)
	{
	canWalkOnSlope = false;
	}
	else
	{
	canWalkOnSlope = true;
	}
	if (isOnSlope && canWalkOnSlope && xInput == 0.0f)
	{
	rb.sharedMaterial = fullFriction;
	}
	else
	{
	rb.sharedMaterial = noFriction;
	}
	}
	private void Jump()
	{
	if (canJump)
	{
	canJump = false;
	isJumping = true;
	newVelocity.Set(0.0f, 0.0f);
	rb.velocity = newVelocity;
	newForce.Set(0.0f, jumpForce);
	rb.AddForce(newForce, ForceMode2D.Impulse);
	}
	}
	private void ApplyMovement()
	{
	if (isGrounded && !isOnSlope && !isJumping) //if not on slope
	{
	Debug.Log("This one");
	newVelocity.Set(movementSpeed * xInput, 0.0f);
	rb.velocity = newVelocity;
	}
	else if (isGrounded && isOnSlope && canWalkOnSlope && !isJumping) //If on slope
	{
	newVelocity.Set(movementSpeed * slopeNormalPerp.x * -xInput, movementSpeed * slopeNormalPerp.y * -xInput);
	rb.velocity = newVelocity;
	}
	else if (!isGrounded) //If in air
	{
	newVelocity.Set(movementSpeed * xInput, rb.velocity.y);
	rb.velocity = newVelocity;
	}
	}
	private void Flip()
	{
	facingDirection *= -1;
	transform.Rotate(0.0f, 180.0f, 0.0f);
	}
	private void OnDrawGizmos()
	{
	Gizmos.DrawWireSphere(groundCheck.position, groundCheckRadius);
	}
	}

https://www.youtube.com/watch?v=QPiZSTEuZnw