The author is intentionally limiting this app to touch-only for touch-capable users. This breaks the game for anyone wanting to use a touchpad or mouse on their touchscreen laptop.

The offending code (from http://gameaboutsquares.com/game.c.js, beautified):

    (function($) {
        try {
            document.createEvent("TouchEvent");
            return;
        } catch (f) {}
        var eventMap = {
            mousedown : "touchstart",
            mouseup : "touchend",
            mousemove : "touchmove"
        };
        // mouse handling code follows

Never do this! Remove the entire try-catch block. There is absolutely no reason for you to be limiting touch-capable users to touch-only.