JSFiddle - React, Tailwind, and code Playground

HTML

<script type="text/javascript" src="http://cdnjs.cloudflare.com/ajax/libs/rxjs/2.3.22/rx.all.js"></script>
<div id="canvas">
    <div id="circles" class="game-container"></div>
    <div id="stats" class="game-container">
        <div id="hits"></div>
        <div id="missclicks"></div>
        <div id="misses"></div>
    </div>
</div>

CSS

#canvas {
    position: relative;
    width: 640px; height: 360px; background: #000000;
    color: #FFFFFF;
    overflow: hidden;
}

.game-container {
    position: absolute;
    background: transparent;
    color: #FFFFFF;
}

.circle {
    position: absolute;
    border-radius: 50%;
    width: 30px;
    height: 30px;
}

JavaScript

// Generated by LiveScript 1.3.1
(function(){
  var O, write, pairsToObj, assoc, toLocal, createCircle, createCircleStream;
  O = Rx.Observable;
  Rx.Observable.repeatFunc = function(it){
    return Rx.Observable['return'](null).map(it).repeat();
  };
  Rx.Observable.prototype.scanCount = function(){
    return this.map(1).scan(0, curry$(function(x$, y$){
      return x$ + y$;
    })).startWith(0);
  };
  write = curry$(function(t, s){
    return t.html(t.html() + s + '<br />');
  });
  pairsToObj = function(it){
    var i$, len$, p, resultObj$ = {};
    for (i$ = 0, len$ = it.length; i$ < len$; ++i$) {
      p = it[i$];
      resultObj$[p[0]] = p[1];
    }
    return resultObj$;
  };
  assoc = curry$(function(m, t){
    var k, v;
    return pairsToObj(
    (function(it){
      var k, v;
      return it.concat((function(){
        var ref$, results$ = [];
        for (k in ref$ = !(k in m) ? t : void 8) {
          v = ref$[k];
          results$.push([k, v]);
        }
        return results$;
      }()));
    })(
    (function(){
      var ref$, results$ = [];
      for (k in ref$ = m) {
        v = ref$[k];
        if (k in t) {
          results$.push([k, t[k]]);
        } else {
          results$.push([k, v]);
        }
      }
      return results$;
    }())));
  });
  toLocal = function(e, x, y){
    var o;
    o = $(e).offset();
    return {
      x: x - o.left,
      y: y - o.top
    };
  };
  createCircle = function(){
    var x, y, color;
    x = Math.random() * ($(canvas).width() - 20);
    y = -40 + Math.random() * 10;
    color = ['#FF0000', '#00FF00', '#0000FF'][Math.floor(Math.random() * 3)];
    return {
      x: x,
      y: y,
      color: color
    };
  };
  createCircleStream = function($canvas, $circles){
    var elem, elemclicks, stream, killstream;
    elem = $('<div/>', {
      'class': 'circle'
    });
    elemclicks = O.fromEvent(elem, 'click').map(function(){
      return true;
    }).first();
    stream =...