This is a micro framework which can be used in conjunction with the DOME engine to make simulation-based games in Wren.
DOME v1.8.0 and above is required for Parcel 2.0
Warning: This framework is an undocumented work in progress, but iterations of it have already been used in different jam projects.
It provides core classes for a World, made of up Zones (with an associated map), which contains a collection of entities.
Entities declare their actions, represented by discrete Action classes, which the engine then executes to modify the world state.
Parcel also keeps a strict seperation between the UI and the world "model", which allows for greater flexibility.
The core architecture was proposed in this article by Bob Nystrom before it was adapted for DOME by Aviv Beeri.