Sorry, but I rated 1/5, because this game is boring, there's no graphics (or I didn't see them s so easy, very repetitive, too short, not funny AT ALL.
Many bugs, can't upload yours towers/enemies, low options (like poison tower, enemies' abilities...), but despite this, this game is very very nice. 4/5.
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Obviously there were no graphics. There were just circles, but they weren't there since there weren't any graphics. o_O