I really like zombie games, and game were you progress and buy things, and shoot game... but this is kinda badly done.
Good graphic, good gameplay... but the micromanagement part is totally screwed up! What's the point to have zombies hitting you for 1 damage 2 times per level when you aren't watchful, when you can easily have 10-20k hp before there are enough zombies to even hit you? What's the point having weapons costing 8k max when you can easily gain 50-60k per level since when you get your first 3rd tier weapon? I rated it 5/5... after a bit 4/5... I'd rate it 3.5/5 if possible now, it's not so it's a 3/5 sorry, it was a wonderfull job.
Honestly real a waste of good graphic (and a waste of time too). Sometimes there are really funny games done with really few resources and poor graphic... sometimes there are these boring ones.
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