Xaber3D engine? Bizarre, I just played the demo and would have SWORN it was using the SS engine - the game is an exact clone, but with more bugs. I had some weirdness where the mouse sensitivity seemed to vary with frame rate, and some sounds kept "locking" and looping.
Sort of fun, but way too buggy. I quite liked Sam (and Sam SE) but I've already uninstalled the demo for this.