neat idea but sucky game for 3 reasons.
reason 1: the whole 50/50 bit makes the game to easily swing in one person's favor. all that has to happen is one side happens to get 3+ strength pieces while the other side gets mostly 3 or less strength piece.
reason 2: there is no strategy to it when EVERY piece moves like a pawn.
reason 3: the pawn being able to kill the king makes sense but the fact the king can't kill the weakest piece in the game is STUPID.
i would strongly suggest rebuilding it on a traditional chess board and have it to where there is a chance for your pieces to appear in any normal position on a chess board. that could be quite interesting because you could end up with minor pieces blocked in the back and major pieces standing in the front for no apparent reason.
in addition it would be nice if you still allowed the traditional rook king switch provided there is a clear route from the king to rook...