Really neat idea for a game. I liked the idea of learning the spells from monsters trying to cast them at you. However, I got stuck because I didn't know how to increase my jump height, and I didn't want to waste letters to expirement. I also couldn't really figure out how to get letters back. Execution could have been a little better, too--just a Unity file as a little frustrating to figure out.
Keep up the good work. If this was polished up, it could be a really cool game.