diff --git a/index.html b/index.html
index edabb6c27834b10cab8f9c87184600709050182f..adab8320ef5bb16862e1c0fae90406fcdc088e74 100644
--- a/index.html
+++ b/index.html
@@ -69,7 +69,6 @@
   </div>
 
   <script src="js/animframe_polyfill.js"></script>
-  <script src="js/hammer.min.js"></script>
   <script src="js/keyboard_input_manager.js"></script>
   <script src="js/html_actuator.js"></script>
   <script src="js/grid.js"></script>
diff --git a/js/keyboard_input_manager.js b/js/keyboard_input_manager.js
index daa8704df06ff99e779d84da2529f2f8ab8137f1..bcd6f199a0a5cc9389f9379e9a85a845de9b8f90 100644
--- a/js/keyboard_input_manager.js
+++ b/js/keyboard_input_manager.js
@@ -60,11 +60,10 @@ KeyboardInputManager.prototype.listen = function () {
   var touchStartClientX, touchStartClientY;
   var gameContainer = document.getElementsByClassName("game-container")[0];
   gameContainer.addEventListener("touchstart", function(event) {
-    if (event.touches.length > 1) {
-      return;
-    }
+    if (event.touches.length > 1) return;
+
     touchStartClientX = event.touches[0].clientX;
-    touchStartClientY = event.touches[0].clientY
+    touchStartClientY = event.touches[0].clientY;
     event.preventDefault();
   });
   gameContainer.addEventListener("touchmove", function(event) {
@@ -76,11 +75,13 @@ KeyboardInputManager.prototype.listen = function () {
     }
     var dx = event.changedTouches[0].clientX - touchStartClientX;
     var absDx = Math.abs(dx);
+
     var dy = event.changedTouches[0].clientY - touchStartClientY;
     var absDy = Math.abs(dy);
+
     if (Math.max(absDx, absDy) > 10) {
-      self.emit("move", absDx > absDy ? (dx > 0 ? 1 : 3) : 
-        (dy > 0 ? 2 : 0)); // (right : left) : (down : up)
+      // (right : left) : (down : up)
+      self.emit("move", absDx > absDy ? (dx > 0 ? 1 : 3) : (dy > 0 ? 2 : 0));
     }
   });
 };