Zinc can create full 2D games, but every game starts with a seed of an idea. Those ideas have to be tested, pushed, and pulled to figure out what works, iterating as rapidly as possible to test and verify what feels good.
Zinc knows this, and as such provides you, by default, with a workflow designed to get you up and running as fast as possible. It gets out of your way as you try to throw things together to just build up a sense of what works.