function write_fire(e)
{var t,n,r;stars[e+"r"]=createDiv("|",12);
boddie.appendChild(stars[e+"r"]);
for(t=bits*e;t<bits+bits*e;t++){stars[t]=createDiv("*",13);
boddie.appendChild(stars[t])}}
function createDiv(e,t)
{var n=document.createElement("div");
n.style.font=t+"px monospace";
n.style.position="absolute";
n.style.backgroundColor="transparent";
n.appendChild(document.createTextNode(e));
return n}
function launch(e){colour[e]=Math.floor(Math.random()*colours.length);Xpos[e+"r"]=swide*.5;Ypos[e+"r"]=shigh-5;bangheight[e]=Math.round((.5+Math.random())*shigh*.4);dX[e+"r"]=(Math.random()-.5)*swide/bangheight[e];if(dX[e+"r"]>1.25)stars[e+"r"].firstChild.nodeValue="/";
else if(dX[e+"r"]<-1.25)stars[e+"r"].firstChild.nodeValue="\\";
else stars[e+"r"].firstChild.nodeValue="|";stars[e+"r"].style.color=colours[colour[e]]}
function bang(e){var t,n,r=0;for(t=bits*e;t<bits+bits*e;t++){n=stars[t].style;n.left=Xpos[t]+"px";n.top=Ypos[t]+"px";if(decay[t])decay[t]--;
else r++;if(decay[t]==15)n.fontSize="7px";
else if(decay[t]==7)n.fontSize="2px";
else if(decay[t]==1)n.visibility="hidden";Xpos[t]+=dX[t];Ypos[t]+=dY[t]+=1.25/intensity[e]}
if(r!=bits)setTimeout("bang("+e+")",speed)}
function stepthrough(e){var t,n,r;var i=Xpos[e+"r"];
var s=Ypos[e+"r"];Xpos[e+"r"]+=dX[e+"r"];Ypos[e+"r"]-=4;
if(Ypos[e+"r"]<bangheight[e]){n=Math.floor(Math.random()*3*colours.length);intensity[e]=5+Math.random()*4;
for(t=e*bits;t<bits+bits*e;t++){Xpos[t]=Xpos[e+"r"];Ypos[t]=Ypos[e+"r"];dY[t]=(Math.random()-.5)*intensity[e];dX[t]=(Math.random()-.5)*(intensity[e]-Math.abs(dY[t]))*1.25;decay[t]=16+Math.floor(Math.random()*16);r=stars[t];if(n<colours.length)r.style.color=colours[t%2?colour[e]:n];
else if(n<2*colours.length)r.style.color=colours[colour[e]];
else r.style.color=colours[t%colours.length];r.style.fontSize="13px";r.style.visibility="visible"}bang(e);launch(e)}stars[e+"r"].style.left=i+"px";stars[e+"r"].style.top=s+"px"}
function set_width(){
var e=999999;
var t=999999;
if(document.documentElement&&document.documentElement.clientWidth)
{if(document.documentElement.clientWidth>0)e=document.documentElement.clientWidth;
if(document.documentElement.clientHeight>0)t=document.documentElement.clientHeight}
if(typeof self.innerWidth!="undefined"&&self.innerWidth){if(self.innerWidth>0&&self.innerWidth<e)e=self.innerWidth;
if(self.innerHeight>0&&self.innerHeight<t)t=self.innerHeight}if(document.body.clientWidth)
{if(document.body.clientWidth>0&&document.body.clientWidth<e)e=document.body.clientWidth;
if(document.body.clientHeight>0&&document.body.clientHeight<t)t=document.body.clientHeight}
if(e==999999||t==999999){e=800;t=600}swide=e;shigh=t}
var bits=80;
var speed=32;
var bangs=5;
var colours=new Array("#03f","#f03","#0e0","#93f","#0cf","#f93","#f0c");
var bangheight=new Array;
var intensity=new Array;
var colour=new Array;
var Xpos=new Array;
var Ypos=new Array;
var dX=new Array;
var dY=new Array;
var stars=new Array;
var decay=new Array;
var swide=800;
var shigh=600;
var boddie;window.onload=function()
{if(document.getElementById){
var e;boddie=document.createElement("div");boddie.style.position="fixed";boddie.style.top="0px";boddie.style.left="0px";boddie.style.overflow="visible";boddie.style.width="1px";boddie.style.height="1px";boddie.style.backgroundColor="transparent";document.body.appendChild(boddie);set_width();
for(e=0;e<bangs;e++){write_fire(e);launch(e);setInterval("stepthrough("+e+")",speed)}}};window.onresize=set_width

  displayMessage() {
//код вызывает сообщение +
playFireworks();
  }

playFireworks(){
//код эффекта
}

      <div class="timer-wrapper">
        <p id="timer"></p>
      </div>
<script src="scripts/timer.js"></script>

let timer; // пока пустая переменная
let x =5; // стартовое значение обратного отсчета
countdown(); // вызов функции

function countdown(){  // функция обратного отсчета
  document.getElementById('rocket').innerHTML = x;
  x--; // уменьшаем число на единицу
  if (x<0){
    clearTimeout(timer); // таймер остановится на нуле
    this.displayTimerMessage()
  }
  else {
    timer = setTimeout(countdown, 1000);
  }
}

  displayTimerMessage() {
   $('.timer-wrapper').fadeIn(800);
    setTimeout(function(){$('#timer').html("Время вышло!")},500)
    setTimeout(function(){$('#timer').html(`К сожалению, вы проиграли.<br>Вы набрали лишь ${this.amount} очков.`)}, 1800)
    setTimeout(() => {
      $('.timer-wrapper').fadeOut(800, () => {
        $('#timer').html("")
        this.resetGame()
      })
    }, 12300)
  }

private totalAngle = 0.0f;

float angle = 45 * (Time.deltaTime / 3.0f);
totalAngle += angle;
if (totalAngle < 45)
transform.Rotate(Vector3.forward, angle);

Quaternion Rotate(Quaternion start, Quaternion end, float rotationTime, float time)
{
     return Quaternion.Lerp(start, end, time/ rotationTime);
}