3D Game Kit is a good starting point to learn Unity and to create your own game. However, the first problem you can encounter if you start using this asset is retargeting. More specifically the lack of quick option to retarget Ellen and the enemy characters to your own 3d model.
I made a tutorial back then to teach you how you can overcome this problem, but the videos were long and hard to follow sometimes. So I decided I make this extension that you can download and import to your project.