Great game... a bit disappointed in the difficulty level. Would have been nice if there was a more gradual progression. The last two levels are much harder then the previous 28.
This game has great potential. It's a nice concept and it's well executed... there are some problems and I think the other commenter have done well to document them. Some ideas for future releases: More cards, animations for actions, a more sophisticated AI, more resources (food, gold, peasants?), some kind of challenge/storyline mode... you could have each difficulty level intrude more resources, more cards (adding a whole new layer of complexity for each higher difficulty level)
Nice game... I agree with some of the previous comments... it would be nice to have differences in the zombies and the explosions really slow down the game. Would be nice to get that fixed.