[BUGFIX] Add touch event handler for retry button

js/keyboard_input_manager.js

@@ -55,6 +55,7 @@ KeyboardInputManager.prototype.listen = function () {
 
   var retry = document.getElementsByClassName("retry-button")[0];
   retry.addEventListener("click", this.restart.bind(this));
+  retry.addEventListener("touchend", this.restart.bind(this));
 
   // Listen to swipe events
   var touchStartClientX, touchStartClientY;