SOURCE

var x=75;
var y=75;
var speed=5;
function setup() { 
createCanvas(500, 500);
} 
function draw(){
background(255)
fill(0)
ellipse(x,y,25,25)
if(keyIsPressed){
if(keyCode==37){
x-=5
}
else if(keyCode==39){
x+=5
}
else if(keyCode==38){
y-=5
}
else if(keyCode==40){
y+=5
}
}

fill(255);
rect(0,0,50,580);
rect(100,0,400,50);
rect(100,100,50,400);
rect(50,450,350,50);
rect(200,50,50,180);
rect(250,300,300,50);
rect(300,130,270,50);
rect(450,350,50,150);
rect(300,220,200,40)
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>