Take a look at the following links for useful resources and sources of information regarding the 2D features provided by Unity:
- Overview of 2D features in Unity: https://unity.com/solutions/2d
- Unity's 2D rogue-like tutorial series: https://unity3d.com/learn/tutorials/s/2d-roguelike-tutorial
- Platform sprites from Daniel Cook's Planet Cute game resources: http://www.lostgarden.com/2007/05/dancs-miraculously-flexible-game.html
- Creating a basic 2D platformer game: https://www.unity3d.com/learn/tutorials/modules/beginner/live-training-archive/creating-a-basic-platformer-game
- Hat Catch 2D game tutorial: https://www.unity3d.com/learn/tutorials/modules/beginner/live-training-archive/2d-catch-game-pt1
- Unity games from a 2D perspective: https://www.unity3d.com/learn/tutorials/modules/beginner/live-training-archive/introduction-to-unity-via-2d
- A fantastic set of modular 2D characters released under the free Creative Commons...
