Cheguei no Creeper, assim:
<meta charset = "UTF-8">
<canvas width ="600" height ="400"></canvas>
<script>
var tela = document.querySelector("canvas");
var pincel = tela.getContext("2d");
// fundo
pincel.fillStyle = "#8B0000";
pincel.fillRect(0, 0, 600, 400);
//cabeça
pincel.fillStyle = "darkgreen";
pincel.fillRect(120,50, 350, 300);
//olhos
pincel.fillStyle = "black";
pincel.fillRect(170, 100, 90, 90);
pincel.fillRect(325, 100, 90, 90);
//nariz
pincel.fillStyle = "black";
pincel.fillRect(257, 190, 70, 100);
//boca
pincel.fillRect(220, 240, 40, 110);
pincel.fillRect(320, 240, 40, 110);
</script>
