Character grid movement using 1 movement input buffering and input filtering delay

PlayerController.cs

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

public enum PlayerState {
	Idle,
	Moving,
	Hit,
	Attack,
	AttackMove
}

public struct Move {
	public float h, v;

    public Move(float h, float v)
    {
        this.h = h;
        this.v = v;
    }
}

public class PlayerController : MonoBehaviour {

	public float speed;	
	public float pressFilterDelay;

	private PlayerState state;
	private float timeOfLastPress;
	private Move? queuedMove;

	// Use this for initialization
	void Start () {
		state = PlayerState.Idle;
		queuedMove = null;
	}
	
	// Update is called once per frame
	void Update () {
		var hor = Input.GetAxis("Horizontal");
		var ver = Input.GetAxis("Vertical");

		if (ver < 0) transform.rotation = Quaternion.Euler(0, 0, -180);
		else if (ver > 0) transform.rotation = Quaternion.Euler(0, 0, 0);
		else if (hor < 0) transform.rotation = Quaternion.Euler(0, 0, 90);
		else if (hor > 0) transform.rotation = Quaternion.Euler(0, 0, -90);

		//transform.position += transform.up * speed * Time.deltaTime; 
		var move = MoveFromInputAxes();
		if (move.h == 0 && move.v == 0) return;
		if (Time.time - timeOfLastPress < pressFilterDelay) return;

		if (state == PlayerState.Idle) {
			print ("from idle to move");
            MoveTo(move);
        }
        else if (state == PlayerState.Moving) {
			// queue up to one movement
			print ("queuing one move");
			queuedMove = move;
		}

		timeOfLastPress = Time.time;
	}

    private Move MoveFromInputAxes()
    {
        return new Move((int)Input.GetAxisRaw("Horizontal"), (int)Input.GetAxisRaw("Vertical"));
    }

    void MoveTo(Move move) {
		var xDir = move.h;
		var yDir = move.v;

		if (xDir == 0 && yDir == 0) return;

		// no diagonals
		if (yDir != 0) xDir = 0; 

		xDir *= 2;
		yDir *= 2;

		state = PlayerState.Moving;

		Vector2 start = transform.position;
		Vector2 end = start + new Vector2(xDir, yDir);
		StartCoroutine(SmoothMove(end));
	}

	IEnumerator SmoothMove(Vector3 end) {
		print ("SmoothMove from: " + transform.position + " to: " + end);
		float startTime = Time.time;
		float sqrRemainingDistance;
		do {			
			sqrRemainingDistance = (transform.position - end).sqrMagnitude;
			float distCovered = (Time.time - startTime) * speed; // betweens [0, 1]		
			transform.position = Vector3.Lerp(transform.position, end, distCovered);
			yield return null;
		} while (sqrRemainingDistance > 0.01f);
		print ("End of SmoothMove");
		transform.position = end; // do not accumulate error

		print("queue " + queuedMove);

		if (queuedMove != null) {
			MoveTo(queuedMove.GetValueOrDefault());
			queuedMove = null;
		} else {
			state = PlayerState.Idle;
		}		
	}
}