It could use a bit of rebalancing. I find it difficult to beat zombies who spam shields because the board is big enough and their AI is advanced enough to do so. I mean, they put up a shield and make a move that instantly recovers the 10 mana lost. I then attack in vain. Then the cycle continues. It's not that I can't rob the zombies of long moves. It just seems to happen that they find paths well with or without the view power, and it just seems to happen that long paths fall into place in its turn. Maybe the shield shouldn't be so punishing.
Earth explodes because he discovers other worlds with sad people, and Earth becomes a figment of his imagination. To him, Earth didn't exist. And his imagination controls him. Maybe.