More interesting twists like this! The way of changing your mind in the middle of the game is nice and it would be even nicer if the towers had classic things like vision, visible directions where they shoot, etc.
But the change in the middle of the game could have been communicated a little better.
I was also a little surprised by the king who kept rising from the dead :)
However - I had a lot, a lot of fun and I think I have a new favorite genre of games. Defense-less games.