This is a port of the Metazelda dungeon generator by Tom Coxon.

You can create dungeon template shapes using the Unity tilemap editor.

A couple screenshots:

https://github.com/jmuzz/metazelda-unity/blob/master/Assets/Screenshots/ss1.png

https://github.com/jmuzz/metazelda-unity/blob/master/Assets/Screenshots/ss2.png

https://github.com/tcoxon/metazelda

Detailed and easy to read explanation about how this works: http://bytten-studio.com/devlog//2012/11/30/lock-and-key-puzzle-generation/

How Tom built the overworld generator on top of this for his game Lenna's Inception, and a comparison of that to some popular roguelikes: http://bytten-studio.com/devlog/2014/09/08/overworld-overview-part-1/

Tom's Blog, mostly about Lenna's Inception: http://bytten-studio.com

These 3 tutorial video series will teach you everything you need to know about how the project is set up.

https://unity3d.com/learn/tutorials/topics/2d-game-creation/introduction-unity-2d-perspective

https://unity3d.com/learn/tutorials/s/2d-roguelike-tutorial

https://unity3d.com/learn/tutorials/topics/2d-game-creation/intro-2d-world-building-w-tilemap