Move Script for 2d Object in Unity

MoveController2D.cs

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

namespace SimpleTDD { 
	public class TDDController2D : MonoBehaviour {
		public enum MoveType {
			SimpleTranslate,
			RaycastCheck,
		};


		public float speed = 5.0f;
		public MoveType moveType = MoveType.RaycastCheck;
		public bool cameraFollow = false;

		// Use this for initialization
		protected Rigidbody2D rigidBody;
		protected ContactFilter2D contactFilter;
		protected RaycastHit2D[] hitBuffer = new RaycastHit2D[16];


		void Start() {

			// 
			rigidBody = GetComponent<Rigidbody2D>();

			// Define the contact Filter, need when do RayCast
			contactFilter.useTriggers = false;
			contactFilter.SetLayerMask (Physics2D.GetLayerCollisionMask (gameObject.layer));
			contactFilter.useLayerMask = true;
		}
		
		// Update is called once per frame
		void Update () {
			HandleMovement ();
		}

		void MoveUsingTranslate(Vector2Int moveVec) 
		{
			Vector3 transVec = new Vector3(moveVec.x, moveVec.y, 0f) * speed * Time.deltaTime;
			transform.Translate (transVec);
		}

		void MoveUsingRayCast(Vector2Int moveVec)
		{
			Vector2 move = new Vector2 (moveVec.x, moveVec.y) * speed * Time.deltaTime;

			float distance = move.magnitude;
			int count = rigidBody.Cast (move, contactFilter, hitBuffer, distance);

			for (int i = 0; i < count; i++) {
				RaycastHit2D hit = hitBuffer [i];

				float modifiedDistance = hit.distance;
				distance = modifiedDistance < distance ? modifiedDistance : distance;
			}

			rigidBody.position = rigidBody.position + move.normalized * distance;
		}


		void Move(Vector2Int moveVec) {
			if (MoveType.RaycastCheck == moveType) {
				MoveUsingRayCast (moveVec);
			} else {
				MoveUsingTranslate (moveVec);
			}
		}

		void UpdateCameraPos() {
			float x = transform.position.x;
			float y = transform.position.y;

			Vector3 pos = Camera.main.transform.position;

			pos.x = x;
			pos.y = y;

			Camera.main.transform.position = pos;
		}


		void HandleMovement() {
			Vector2Int moveVec = Vector2Int.zero;

			if (Input.GetKey (KeyCode.UpArrow)) {
				moveVec = new Vector2Int (0, 1);

			} else if (Input.GetKey (KeyCode.DownArrow)) {
				moveVec = new Vector2Int(0, -1);
			} else if (Input.GetKey (KeyCode.LeftArrow)) {
				moveVec = new Vector2Int(-1, 0);
			} else if (Input.GetKey (KeyCode.RightArrow)) {
				moveVec = new Vector2Int(1, 0);
			}

			Move (moveVec);

			if (cameraFollow) {
				UpdateCameraPos ();
			}
		}
	}
}