Thanks,
It's visually 3D but the engine is an hybrid based on 2D. It's the reason for the locked camera and the rough animations, it's a 2D sprite sheet, here the death animation of the raptor for south orientation:
I compute lighting and shadows coupled with other factors like spatialized sounds to make the illusion of 3D.
It's kind of a personal challenge to see how far I can push some 2D techniques to make 3D.