I didn´t watch the Kabus video but of course I know the Kabus screenshots and I just don´t find them very impressive and a good example.

I am sure the primitive Gamestudio z-buffer style shadows can be faked very easily with Unity indie. Just squeeze a copy of the model or something. That´s how they work after all. You also aren´t limited to using fuzzy blobs as shadows but can use something more accurate (maybe even animated).

Like always it´s really funny how AAA games enter the discussion. You won´t be able to compete by using any engine if you don´t have a multi million dollar budget.