AAQR: GRave Defense HD (free, $1.99)

GRave Defense is a "fixed path" tower defense game. It has a cute story, and it has a few interesting features such as multiple entrances and exits, and some of the weapons are interesting, but that's about it.(To clarifiy, I classify tower defense games into "grid" vs. "fixed path". This one is fixed path variant: multiple entrances and exits. )The story is typical nuclear apocalypse, humanity survived by hiding in vaults. Outside, the landscape has recovered... except for all these nasties

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