I'm a small-time Indie Game developer, I love a good game, no matter what genre, rating, audience is.
Actually, this is quite good compared to other CUBE 2 projects. I've used CUBE 2 before, so I know its not easy. The mapmode is pretty simple(Maybe because I've used CUBE 2). The campaign is pretty blank to me( Nazi zombies?).
But if can get past the whole nazis-are-zombies-here-insert-explaniation-here campaign, then you'll enjoy the small bit of ZCUBE that has been released.