Joined:
Apr 2012
Post count:
1
Part of what makes the series so popular may be the fact that it is a Flash game series as well, so the mobile iterations are hyped when they finally release months later. As well, the game gives a ton of content for $2.99 (over 20 maps, and over a dozen units), AND this version has IAP monetization with two currencies (though each can be earned in-game as well).
That the game does traditional tower defense very well and scales the intensity way up is part of the continued appeal. I imagine their initial burst is thanks to their base, and once they get up there, the jetstream that allows titles to swirl around in the ranks keeps it up for a while.
