Comment by mrDIMAS

The game and the editor are massively helps to find right approaches in development. All my previous attempts to write engines (in other languages) were bad because all they had is just some very simple demos with some meshes and lights. You never know which features engine should have until you need them. Many engines trying to have best possible graphics and does not pay attention to other very important things, like sound, animation, physics, resource management, save/load, editor, etc.