I personally thought it reminds me of another cancelled FPS game called Gorge Tour to an extent, with its cartoonish-looking enemies and crazy guns. Search it for yourself to see what it was all about and you might get some of the idea.

Unreal engines are famous for titanium trees... indestructible environments. I wonder if IllWill will have some measure of destroyable architecture, plus debris modelling ala the first FEAR.