<div class="game">
  <header>
    <div class="title">Whack a Dino!</div>

    <div class="scoreboard">
      <div>Score: <span class="score">0</span></div>
      <div>Time: <span class="time">60</span>s</div>
    </div>
  </header>

  <div class="field">
    <div class="dino dino--original">
      <div class="points">100</div>

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        <g id="Dino">
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  </div>

  <button class="start">START!</button>
</div>
html,
body {
  height: 100%;
}

body {
  background-color: #4dbd76;
  background: rgb(77,189,118);
  background: radial-gradient(circle, rgba(77,189,118,1) 0%, rgba(60,136,143,1) 100%);
  font-family: "Open Sans", Arial, Helvetica, sans-serif;
}

.game {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  display: grid;
  grid-template-rows: auto 1fr 40px;
  justify-items: center;
  padding: 20px 10px;
}

.title {
  font-family: Modak, sans-serif;
  color: #ff8c00;
  font-size: 36px;
  letter-spacing: 2px;
  text-shadow: 1px 1px rgb(123, 67, 0);
  text-transform: uppercase;
}

.scoreboard {
  width: 100%;
  text-align: center;
  color: #FFF;
  font-size: 18px;
  display: flex;
  justify-content: space-around;
}

.start {
  position: relative;
  top: -20px;
  background-color: darkorange;
  color: #FFF;
  letter-spacing: 2px;
  font-weight: 600;
  font-size: 20px;
  border-radius: 4px;
  padding: 6px 20px;
  border: none;
  box-sizing: border-box;
  height: 40px;
  width: 200px;
  box-shadow: 2px 2px 4px rgb(123, 67, 0);
  text-shadow: -1px -1px rgba(0,0,0,0.3);
  cursor: pointer;
}

.start:focus {
  outline: none;
}

.start:active {
  box-shadow: inset 1px 1px 1px rgba(123, 67, 0, 0.49);
  outline: none;
}

@keyframes shake {
  45% { transform: translateX(0); }
  50% { transform: translateX(-6px); }
  60% { transform: translateX(6px); }
  65% { transform: translateX(0); }
}

.shake {
  animation: shake 300ms linear;
}

.field {
  width: 100%;
  max-width: 360px;
  margin: auto;
  position: relative;
  top: -30px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  justify-content: center;
  align-content: center;
}

.dino {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 110px;
  position: relative;
}

.dino:nth-child(3n),
.dino:nth-child(3n+1){
  position: relative;
  top: 60px;
}

.dino:last-child {
  grid-column-start: 2;
  top: 0;
}

@keyframes fadeUp {
  from { 
    transform: translateY(0) scale(1); 
    opacity: 0;
  }
  to { 
    transform: translateY(-15px) scale(1.2); 
    opacity: 1;
  }
}

.fadeUp {
  animation: fadeUp 500ms ease-out;
}

.points {
  position: absolute;
  top: 0;
  opacity: 0;
  color: #ffeb3b;
  text-shadow: 1px 1px #000;
  font-family: monospace;
  font-size: 1.4em;
  font-weight: bold;
  z-index: 1;
  pointer-events: none;
}

.points--red {
  color: #EF5350;
}

@keyframes slowly-peeking {
  0% { transform: translateY(80%); }
  20% { transform: translateY(80%); }
  40% { transform: translateY(10%); }
  42% { transform: translateY(25%); }
  70% { transform: translateY(25%); }
  90% { transform: translateY(-26%); }
  97.5% { transform: translateY(-26%); }
  99% { transform: translateY(-34%); }
  100% { transform: translateY(80%); }
}

@keyframes peeking {
  10% { transform: translateY(80%); }
  25% { transform: translateY(-26%); }
  27.5% { transform: translateY(-26%); }
  29% { transform: translateY(-26%); }
  30% { transform: translateY(-26%); }
  34% { transform: translateY(-34%); }
  36% { transform: translateY(80%); }
}

.dino #Dino {
  transform: translateY(80%);
  animation: slowly-peeking 10s infinite;
}

.no-touch .dino #Dino {
  cursor: pointer;
}

svg {
  user-select: none;
  outline: none;
}

.hide {
  visibility: hidden;
  pointer-events: none;
}
View Compiled
let dinoOriginal = document.querySelector('.dino--original');
let fieldEl = document.querySelector('.field');
let scoreEl = document.querySelector('.score');
let startEl = document.querySelector('.start');
let timeEl = document.querySelector('.time');
let dinosFrag = document.createDocumentFragment();
let max = 7;
let dinos = [];
let score = 0;
let isTouch = true;
let isRunning = false;
let time = 60;
let timer = null;

function shake() {
  fieldEl.classList.add('shake');
  
  fieldEl.addEventListener('animationend', () => {
    fieldEl.classList.remove('shake');
  });
}

function setTimer() {
  time = 60;
  timeEl.innerText = time;
  
  timer = setInterval(function() {
    time = time - 1;
    timeEl.innerText = time;
    
    if (time <= 0) {
      gameOver();
    }
  }, 1000);
}

function start() {
  for (let i = 0; i < dinos.length; i++) {
    let dinoSVG = dinos[i].querySelector('#Dino');
    dinoSVG.style.transform = 'translateY(80%)';
    dinoSVG.style.animation = 'peeking 5.5s infinite';
    dinoSVG.querySelector('#DeadEyes').style.display = 'none';
    dinoSVG.querySelector('#Tongue').style.display = 'none';
    dinoSVG.querySelector('#AngryEyebrows').style.display = 'none';
    dinoSVG.style.animationDelay = (1000 + (i * 700)) + Math.floor((Math.random() * 4000)) + 'ms'
  }
  
  if (!isRunning) {
    setTimer();
    startEl.classList.add('hide');
    score = 0;
    scoreEl.innerText = score;
    isRunning = true;
  }
}

function gameOver() {
  clearInterval(timer);
  isRunning = false;
  startEl.classList.remove('hide');
  
  for (let i = 0; i < dinos.length; i++) {
    let dinoSVG = dinos[i].querySelector('#Dino');
    dinoSVG.style.transform = 'translateY(80%)';
    dinoSVG.style.animation = 'slowly-peeking 10s infinite';
    dinoSVG.style.animationDelay = (Math.random() * 5000) + 'ms';
  }
}

function init() {
  for (let i = 0; i < max; i++) {
    let dino = dinoOriginal.cloneNode(true);
    let dinoSVG = dino.querySelector('#Dino');
    let dir = [1, -1][Math.floor(Math.random() * 2)];
    let showHorn = (Math.random() * 10) > 5;
    let isGentleman = (Math.random() * 10) > 9;

    dino.querySelector('svg').style.transform = `scaleX(${dir})`;

    dinoSVG.style.animation = 'slowly-peeking 10s infinite';
    dinoSVG.style.animationDelay = (Math.random() * 5000) + 'ms';
    
    dinoSVG.querySelector('#DeadEyes').style.display = 'none';
    dinoSVG.querySelector('#Tongue').style.display = 'none';
    dinoSVG.querySelector('#AngryEyebrows').style.display = 'none';
    dinoSVG.querySelector('#TopHat').style.display = 'none';
    dinoSVG.querySelector('#Monocle').style.display = 'none';

    if (showHorn) {
      dinoSVG.querySelector('#Horn').style.display = 'block';
    } else {
      dinoSVG.querySelector('#Horn').style.display = 'none';
    }
    
    if (isGentleman) {
      dinoSVG.querySelector('#TopHat').style.display = 'block';
      dinoSVG.querySelector('#Monocle').style.display = 'block';
      dinoSVG.querySelector('#Horn').style.display = 'none';
    }

    dino.addEventListener('animationiteration', function(ev) {
      let dir = [1, -1][Math.floor(Math.random() * 2)];
      let showHorn = (Math.random() * 10) > 5;
      let isGentleman = (Math.random() * 10) > 9;

      dino.querySelector('svg').style.transform = `scaleX(${dir})`;
      
      dinoSVG.querySelector('#DeadEyes').style.display = 'none';
      dinoSVG.querySelector('#Tongue').style.display = 'none';
      dinoSVG.querySelector('#AngryEyebrows').style.display = 'none';
      dinoSVG.querySelector('#Eyes').style.display = 'block';
      dinoSVG.querySelector('#TopHat').style.display = 'none';
      dinoSVG.querySelector('#Monocle').style.display = 'none';

      if (showHorn) {
        dinoSVG.querySelector('#Horn').style.display = 'block';
      } else {
        dinoSVG.querySelector('#Horn').style.display = 'none';
      }
      
      if (isGentleman) {
        dinoSVG.querySelector('#TopHat').style.display = 'block';
        dinoSVG.querySelector('#Monocle').style.display = 'block';
        dinoSVG.querySelector('#Horn').style.display = 'none';
      }
    });

    function whack(ev) {
      if (isRunning) {
        let pointsEl = dino.querySelector('.points');
        
        if (dinoSVG.querySelector('#Horn').style.display === 'none') {
          score = score + 60;
          dinoSVG.querySelector('#DeadEyes').style.display = 'block';
          dinoSVG.querySelector('#Tongue').style.display = 'block';
          dinoSVG.querySelector('#Eyes').style.display = 'none';
          
          pointsEl.innerText = '60';
        } else {
          score = score - 20;
          score = Math.max(0, score);
          dinoSVG.querySelector('#AngryEyebrows').style.display = 'block';
          
          pointsEl.innerText = '-20';
          pointsEl.classList.add('points--red');
          
          shake();
        }
        
        pointsEl.classList.add('fadeUp');
        pointsEl.addEventListener('animationend', () => {
          pointsEl.classList.remove('fadeUp');
          pointsEl.classList.remove('points--red');
        });
        
        scoreEl.innerText = score;
      }
    }

    if (isTouch) {
      dinoSVG.addEventListener('touchend', whack);
    } else {
      dinoSVG.addEventListener('click', whack);
    }

    dinosFrag.appendChild(dino);
    dinos.push(dino);
  }

  fieldEl.appendChild(dinosFrag);
  dinoOriginal.remove();
  
  startEl.addEventListener('click', start);
}

window.addEventListener('load', function() {
  isTouch = document.querySelector('html').classList.contains('touch');
  init();
});

External CSS

  1. https://fonts.googleapis.com/css?family=Modak|Open+Sans

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.3/modernizr.min.js