15x15!! nice work getting so far :)
yep, I think I needed more levels of Zoms, tougher ones that burrow straight through a bit more,.. exploding ones,.. etc etc, that or more Heart positions as the board expands.
Keybinds are a great shout, and yeah it was mean of me to lock in the choice, I should have made it a toggle option.
Glad you found the Zombies made it more interesting/enjoyable, I did to :D. but I have my balance way off on the zoms right now :),
thanks for playing!