Creeper

Bom dia, assim ficou meu creeper.

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

<script>

    var tela = document.querySelector('canvas');         
    var pincel = tela.getContext('2d');            

    pincel.fillStyle = 'darkgreen';            
    pincel.fillRect(0,0,600,400);            

    pincel.fillStyle = 'black';            
    pincel.fillRect(100,50,150,150);    

    pincel.fillStyle = 'black';            
    pincel.fillRect(350,50,150,150);    

    pincel.fillStyle = 'black';            
    pincel.fillRect(250,200,100,150);    

    pincel.fillStyle = 'black';            
    pincel.fillRect(175,275,75,150);    

    pincel.fillStyle = 'black';            
    pincel.fillRect(345,275,75,150);    


</script>