Movement Code v2.0!

GridMove.cs

using System.Collections;
using UnityEngine;
 
class GridMove : MonoBehaviour {
    public float moveSpeed;
    public float gridSize;
    
	public enum PlayerState {MOVING, STOPPED};
	public enum Direction {UP, DOWN, LEFT, RIGHT};
	
    public Vector2 input;
    private Vector3 startPosition;
    private Vector3 endPosition;
    private float t;
 	
	public PlayerState state;
	public Direction facing;
	
	void Start() {
		state = PlayerState.STOPPED;
		facing = Direction.RIGHT;
		input = new Vector2(0,0);
	}
	
    public void Update() {
		
		getInput();
		
		if (state != PlayerState.MOVING) {			
            if (input != Vector2.zero) {
                StartCoroutine(move());
            }
        }
    }
 	
    public IEnumerator move() {
        state = PlayerState.MOVING;
        startPosition = transform.position;
        t = 0;
			
		float endPosX = startPosition.x + System.Math.Sign(input.x) * gridSize;
		float endPosZ = startPosition.z + System.Math.Sign(input.y) * gridSize;
		//Check bounds
		if(endPosX > 13 || endPosX < 0 || endPosZ > 13 || endPosZ < 0) {
			endPosition = startPosition; //No movement or we go off the board
			//state = PlayerState.STOPPED;
		}
		else {
        	endPosition = new Vector3(endPosX, startPosition.y, endPosZ);
		}
 
        while (t < 1f) {
            t += Time.deltaTime * (moveSpeed/gridSize);
            transform.position = Vector3.Lerp(startPosition, endPosition, t);
            yield return null;
        }
 
        state = PlayerState.STOPPED;
        yield return null;
    }
	
	void getInput() {
		//set facing direction on getKeyDown
		if(Input.GetKeyDown("up")) {
			if(facing != Direction.DOWN) {
				facing = Direction.UP;
				input.y = 1;
				input.x = 0;
			}
		} else if(Input.GetKeyDown("left")) {
			if(facing != Direction.RIGHT) {
				facing = Direction.LEFT;
				input.y = 0;
				input.x = -1;
			}
		} else if(Input.GetKeyDown("down")) {
			if(facing != Direction.UP) {
				facing = Direction.DOWN;
				input.y = -1;
				input.x = 0;
			}
		} else if(Input.GetKeyDown("right")) {
			if(facing != Direction.LEFT) {
				facing = Direction.RIGHT;
				input.y = 0;
				input.x = 1;
			}
		}
	}
}