Moscrif use game2d game engine, which is part of our open source framework. It means that the developers can fully adapt it to their requirements. This engine simplifies creating 2D games without physics simulation like Snake or Pac Man. It consists of three classes: Layers, Sprite and Tiled. To use game 2d engine, it is required to include game2d libraries into project preferences.
For real example of game engine please see Snake demo or Snake tutorial.