As per #13

Currently there isn't much of a system to handle entities and especially different types of them. As the game's complexity and feature set grows we will need at least some minimal system for this.

My suggestion would be a simple class based approach, while maybe not truly an entity component system, it will probably handle most of what we care about for the foreseeable and be easy enough for people to understand.

There is a very basic system in Arcade's platformer tutorial here: https://api.arcade.academy/en/latest/examples/platform_tutorial/step_17.html

This is a simple and straight forward system, however maybe not the most flexible. Definitely this is open for discussion/suggestions on what might be the best approach.