Cool game, but clearly shows why the original games zombies were stupid by attacking from many rows. can be easily beaten by stacking on one row. I like however that the leaf cost associated with placing zombies encourages to save your materials and take risks.
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In fact, it is quit easy to beat the game with the current win condition... I thought of making it so that you have to defeat all plants to actually succeed a level instead of just having to reach the house like in the real game. This would have unlocked quite a hole lot of new level design questions which I had no time for unfortunately...