I like the concept, even if it surely need some more twist.
But like other says, too much time to wait between 2 move, and pieces can sometimes eat you but don't.
But even with a smarter AI, some move visualization could help, make each piece move one after another (this will also prevent pieces from overlapping).
It can also be interesting that once we reached the last line, the pawn become a queen and the prey become the predator. (like in real chess)