Game contains data about the game world. The data itself is not smart enough to do anything asides return some basic information about itself.

Controllers contains objects that directly manipulate game data. The objects are stateless. They make decisions about how actions effect game objects, but don't make any decisions about when to execute those changes.

Updaters contains objects that are polled once each refresh. They make decisions about what should be happening to objects based on the current game state, and pass those decisions onto the appropriate controller.

Renderers render an object to a canvas layer. They are called once per refresh but should only change the layer state if the object/s they render have changed in some way.

Scenes coordinate which updaters and renderers should be running at any given time.

io contains objects that load dungeon data, and setup a game environment based on that data. Maps should be created using the mapmaker library.

input contains representations of user input, and provides the interface for retrieving input events.