same old
it's kind of sad how little originality is left... This game is ok for what it is, but it's just a copy of 100 other games.
It lags horribly, is ridiculously easy - I let it run unattended from level 18 to 35 before it started slowing down everything else on my computer, and there is aparently no way to get rid of a tower if you want to put something else in it's place.
if you want to copy a tower defence game, xeno tactic is the king of this genre.