Logica

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(BoxCollider2D))]
public class Logica : MonoBehaviour {

    [SerializeField]
    private LayerMask _layerMask;

    private Vector2 _velocity;
    private const float GRAVATY = -9.8f;

    private int _verticalRayAmount = 4;
    private float _verticalRaySpaceing;

    private BoxCollider2D _collider;
    private Bounds _bounds;
    private float _inset = 0.025f;
    private Vector2 _rayCastPostion;

    private void Start()
    {
        _collider = GetComponent<BoxCollider2D>();
    }

    private void Update()
    {
        _velocity.y += GRAVATY * Time.deltaTime;

        MovePlayer(_velocity);
    }

    private void MovePlayer(Vector2 velocity)
    {
        UpdateBounds();

        VecticalCollision(ref velocity);

        transform.Translate(velocity * Time.deltaTime);
    }

    private void VecticalCollision(ref Vector2 velocity)
    {
        float verticalDirection = Mathf.Sign(velocity.y);
        float verticalRayLenght = Mathf.Abs(velocity.y) + _inset;

        for(int i = 0; i < _verticalRayAmount; i++)
        {
            Vector2 vect = _rayCastPostion + Vector2.right * _verticalRaySpaceing * i;
            Debug.DrawRay(vect, Vector2.up * verticalDirection, Color.green);

            RaycastHit2D rayCastHit = Physics2D.Raycast(vect, Vector2.up * verticalDirection, verticalRayLenght, _layerMask);
            if(rayCastHit)
            {
                velocity.y = (rayCastHit.distance - _inset) * verticalDirection;
            }
        }
    }

    private void UpdateBounds()
    {
        _bounds = _collider.bounds;
        _bounds.Expand(_inset * -2f);
        _rayCastPostion = new Vector2(_bounds.min.x, _bounds.min.y);

        _verticalRaySpaceing = _bounds.size.x / (_verticalRayAmount - 1);
    }
}