Solución Creeper

<canvas width="600" height="400"></canvas>


<script>
    var pantalla = document.querySelector("canvas");
    var pincel = pantalla.getContext("2d");
    // pantalla
    pincel.fillStyle = "gray"
    pincel.fillRect(0,0,600,400);
    // cabeza
    pincel.fillStyle = "darkgreen";
    pincel.fillRect(125,50,350,300);
    // ojos_01
    pincel.fillStyle = "black";
    pincel.fillRect(175,120,90,90);
    // ojos_02
    pincel.fillStyle = "black";
    pincel.fillRect(335,120,90,90);
    // nariz
    pincel.fillStyle = "black";
    pincel.fillRect(265,210,70,100);
    // boca parte_1
    pincel.fillStyle = "black";
    pincel.fillRect(225,240,40,110);
    // boca parte_2
    pincel.fillStyle = "black";
    pincel.fillRect(335,240,40,110);

</script>