Bug: I purchased the diamond drill (as my last purchase; I bought the emerald drill as my first purchase) and it did not upgrade. I attempted to do so five times, checking after each purchase, and I still had the emerald drill.
Just a 4. Game play is good, but the ability to earn edicts on already completed levels (even just one edict on a replay versus the two for the original) would have pushed it over the top to a 5 for me.
Great game, but two upgrades for the next version:
1) Ability to set a quantity of zombies to attack, instead of the +/-.
2) Ability to stay on the current continent instead of being kicked back to the world map after every battle.
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