Leevz.io crosshair pointer

A crosshair pointer for leevz.io(and the first ever leevz.io script)

Install this script?
Author's suggested script

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Install this script
// ==UserScript==
// @name         Leevz.io crosshair pointer
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  A crosshair pointer for leevz.io(and the first ever leevz.io script)
// @author       mint
// @match        https://leevz.io/
// @grant        none
// ==/UserScript==
    'use strict';
alert("If you can see this it means that the script is working.(you can get rid of this by deleting the alert line in the code)");
var cursorStyle = "crosshair";
var cursorRefresh = function() { document.getElementById("canvas").style.cursor = cursorStyle; };
window.onmouseup = function() { cursorStyle = "crosshair"; cursorRefresh(); };
window.onmousedown = function() { cursorStyle = "all-scroll"; cursorRefresh(); };
window.onmousemove = function() { if ( document.getElementById("canvas").style.cursor != cursorStyle ) { cursorStyle = "crosshair"; cursorRefresh(); } };