Version: 1.4.1 (Mar 10, 2015)
Asset Store Link – http://www.assetstore.unity3d.com/en/#!/content/26617
*Requires Unity 4.6.1 or higher.
The Corgi Engine is the most complete 2D platformer / run & gun solution out there.
It's a tight (non physics based controls) character controller for your game. It's very fast and works on desktop and mobile. Run, shoot, dash, use a jetpack, and much, much more!