Simple p5.play collision

sketch.js

var player;
var enemy;
var angle;
var speed;

function setup() {
  createCanvas(windowWidth,windowHeight);
  player = createSprite(0, 0, 50, 50);
  enemy = createSprite(width/2, height/2, 100, 100);

  speed = 1;
  angle = 270;
}

function draw() {
  background(255,255,255);  
  enemy.setSpeed(speed, angle);
  drawSprites();
  checkForWallCollisions();
  player.position.x = mouseX;
  player.position.y = mouseY;
  
  if (player.overlap(enemy)) {
    alert("You hit the enemy!");
  }
}

function checkForWallCollisions() {
  if (enemy.position.x > width) {
  	angle = 180;
  }

  if (enemy.position.x < 0) {
  	angle = 0;
  }

  if (enemy.position.y > height) {
  	angle = 270;
  }

  if (enemy.position.y < 0) {
  	angle = 90;
  }

}