During the summer I got more and more entangled game entity classes in my game project, and I really wish I had read this before I started on my journey. I recently stumbled on this article talking about why OOP is not really good for (larger) games to manage game entities, and that introduced me to a better approach. I have yet to test this out in Leadwerks as I am trying to learn more about this before taking a major overhaul. Anyway I hope this could help other people here that might struggle with this.
Link to article: http://www.gamedev.net/page/resources/_/technical/game-programming/understanding-component-entity-systems-r3013