===================================================================
--- original.js
+++ change.js
@@ -121,8 +121,37 @@
 // Update game logic
 game.update = function () {
 	// Update hero
 	hero.update();
+	// Add keyboard event listeners for hero movement
+	document.addEventListener('keydown', function (event) {
+		switch (event.key) {
+			case 'w':
+				// Move hero forward
+				if (hero.y > 0) {
+					hero.y -= hero.speed;
+				}
+				break;
+			case 'a':
+				// Move hero left
+				if (hero.x > 0) {
+					hero.x -= hero.speed;
+				}
+				break;
+			case 's':
+				// Move hero back
+				if (hero.y < 2732) {
+					hero.y += hero.speed;
+				}
+				break;
+			case 'd':
+				// Move hero right
+				if (hero.x < 2048) {
+					hero.x += hero.speed;
+				}
+				break;
+		}
+	});
 	// Update enemies
 	for (var i = enemies.length - 1; i >= 0; i--) {
 		enemies[i].update();
 		if (enemies[i].intersects(hero)) {