Terrain Engine 2D is a fast and full featured Unity 2D block engine. It allows you to procedurally generate complex and destructable 2D terrain through a simple terrain generation framework. With this framework you can generate almost anything you can imagine. There are a few example projects included in the asset which can get you started, or continue reading through the documentation for more information.
The user manual is here to help you get started with the engine. Checkout the Intro tab for information on the contents of the engine and how to setup your scene. The General tab holds all the important information you need to start using the engine. The Main Properties tab holds in depth information on all the features of the engine which will be useful to you if you wish to gain a better understanding of how everything works!