Interesting take on a two player game, I played it myself though which was interesting.
I think it might be difficult to play two player and communicate in time with the guards attacking a bit more of a delay to their appearance would have given you more time to accumulate to the controls.
That said it was a very cool game and I enjoyed playing. Only managed to get to 29 flowers but my giant kept quick turning when I was trying to attack and I couldn't figure out why he was doing that.