Hola que tal les dejo la solución para crear la cara del creeper:
<body>
<canvas width="800" height="800"> </canvas>
</body>
<script src="./main.js">
</script>
const canvas = document.querySelector("canvas");
const marker = canvas.getContext("2d");
//Background
marker.fillStyle = "#5D8F6A";
marker.fillRect(0, 0, 800, 800);
//Eyes
marker.fillStyle = "#202020";
marker.fillRect(100, 100, 200, 200);
marker.fillRect(500, 100, 200, 200);
//Body
marker.fillRect(300, 300, 200, 250);
marker.fillRect(200, 400, 100, 300);
marker.fillRect(500, 400, 100, 300);
