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Played a lot of TD and mauls in WC3 and this catches a lot of positives from those.
Only things I'd change are Squirt Towers are possibly a bit overpowered, and the air is a bit too easy for non-swarm towers to take care of (ie swarm towers are not actually needed in some cases).
Overall great job, 5/5.
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As it's been said, this tower defense game's defined by your maze. It adds a lot of replay value to the game, making it one of the better games you'll find.
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I disagree, Robubie. There are a lot of tower defense games out there, and a lot of them are inspired by Warcraft III, but this one is unique in that the towers themselves define the actual path. There's a lot of strategy in creating your own maze.