This is the class we're using for our pacman to be controlled and managed in the game.

Pacman.cs

using UnityEngine;
using System.Collections;



public class Pacman : MonoBehaviour {

    public float defaultSpeed = 0.2f;
    public Vector2 direction;
    Vector2 next;
    public int[,] game;
    public int state;


	// Use this for initialization
	void Start () {
	    direction = Vector2.zero;
        transform.position = new Vector2(14.5f, 15.5f);
	}


    void Update()
    {
        SetDirection();
    }

    void FixedUpdate()
    {
        if (this.gameObject.transform.position.x < 0.7f)   
            this.gameObject.transform.position = new Vector3(27.5f - this.gameObject.transform.position.x, this.gameObject.transform.position.y, 0f);
        else if (this.gameObject.transform.position.x > 27.5f)
            this.gameObject.transform.position = new Vector3(0.6f, this.gameObject.transform.position.y, 0f);
        

            Move();
    }


    void OnCollisionEnter(Collision col)
    {
         if (direction == Vector2.up && game[(int)this.gameObject.transform.position.y + 1, (int)this.gameObject.transform.position.x] == 1)
            direction = Vector2.zero;
       
        if (direction == Vector2.down && game[(int)this.gameObject.transform.position.y - 1, (int)this.gameObject.transform.position.x] == 1)
            direction = Vector2.zero;
        
        if (direction == Vector2.left && game[(int)this.gameObject.transform.position.y, (int)this.gameObject.transform.position.x - 1] == 1)
            direction = Vector2.zero;
       
        if (direction == Vector2.right && game[(int)this.gameObject.transform.position.y, (int)this.gameObject.transform.position.x + 1] == 1)
            direction = Vector2.zero;            
    }

    public void Pause()
    {
        
    }


    void SetDirection()
    {
        if (Input.GetKeyDown(Player1CtrlRemap.kcForward) || Input.GetAxis("Vertical") > 0.7)
        {
            Debug.Log("haut :" + Player1CtrlRemap.kcForward.ToString() + "bas" + Player1CtrlRemap.kcDownward.ToString() + "droite" + Player1CtrlRemap.kcRight.ToString() + "gauche:" + Player1CtrlRemap.kcLeft.ToString());
            next = Vector2.up;
            if (game[(int)this.gameObject.transform.position.y + 1, (int)this.gameObject.transform.position.x] != 1)
                direction = Vector2.up;
        }
        if (Input.GetKeyDown(Player1CtrlRemap.kcDownward) || Input.GetAxis("Vertical") < -0.7)
        {
            Debug.Log("haut :" + Player1CtrlRemap.kcForward.ToString() + "bas" + Player1CtrlRemap.kcDownward.ToString() + "droite" + Player1CtrlRemap.kcRight.ToString() + "gauche:" + Player1CtrlRemap.kcLeft.ToString());
            next = Vector2.down;
            if (game[(int)this.gameObject.transform.position.y - 1, (int)this.gameObject.transform.position.x] != 1)
                direction = Vector2.down;
        }
        if (Input.GetKeyDown(Player1CtrlRemap.kcLeft) || Input.GetAxis("Horizontal") < -0.7)
        {
            Debug.Log("haut :" + Player1CtrlRemap.kcForward.ToString() + "bas" + Player1CtrlRemap.kcDownward.ToString() + "droite" + Player1CtrlRemap.kcRight.ToString() + "gauche:" + Player1CtrlRemap.kcLeft.ToString());
            next = Vector2.left;
            if (game[(int)this.gameObject.transform.position.y, (int)this.gameObject.transform.position.x - 1] != 1)
                direction = Vector2.left;
        }
        if (Input.GetKeyDown(Player1CtrlRemap.kcRight) || Input.GetAxis("Horizontal") > 0.7)
        {
            Debug.Log("haut :" + Player1CtrlRemap.kcForward.ToString() + "bas" + Player1CtrlRemap.kcDownward.ToString() + "droite" + Player1CtrlRemap.kcRight.ToString() + "gauche:" + Player1CtrlRemap.kcLeft.ToString());
            Debug.Log((int)Player1CtrlRemap.kcDownward);
            next = Vector2.right;
            if (game[(int)this.gameObject.transform.position.y, (int)this.gameObject.transform.position.x + 1] != 1)
                direction = Vector2.right;
        }
    }
   

    void Move()
    {
        var pos = new Vector2(this.gameObject.transform.position.x,
        this.gameObject.transform.position.y);
        var x = System.Math.Round(pos.x, 1) - System.Math.Floor(pos.x);
        var y = System.Math.Round(pos.y, 1) - System.Math.Floor(pos.y);
        if (x >= 0.4 && x <= 0.6 && y >= 0.4 && y <= 0.6)
        //if (x == 0.5 && y == 0.5)
        {
            if (next == Vector2.up && game[(int)this.gameObject.transform.position.y + 1, (int)this.gameObject.transform.position.x] != 1)
            {
                direction = next;
                next = Vector2.zero;
            }
            if (next == Vector2.down && game[(int)this.gameObject.transform.position.y - 1, (int)this.gameObject.transform.position.x] != 1)
            {
                direction = next;
                next = Vector2.zero;
            }
            if (next == Vector2.left && game[(int)this.gameObject.transform.position.y, (int)this.gameObject.transform.position.x - 1] != 1)
            {
                direction = next;
                next = Vector2.zero;
            }
            if (next == Vector2.right && game[(int)this.gameObject.transform.position.y, (int)this.gameObject.transform.position.x + 1] != 1)
            {
                direction = next;
                next = Vector2.zero;
            } 
        }       
        if(!pauseScript.paused)
            transform.position = (Vector2)transform.position + defaultSpeed * direction;
    }
}