Not great, but pritty good
It is an interesting take on the "destroy the castle" (DtC) concept, but it laks any real challenge. The only lvl that I had trouble with was 26, and I managed to 1 shot even it after a few mins of working on it. The added accuracy of this method of DtC makes it almost to easy. Also other than the view/method of attack, there was nothing really new.
All that said, I did enjoy the game for about 20-30min, and it was a fun quick play though, so 7 stars.