It is a decent game... a tad on the easy side. I'd play it more if it had a pause button since some of the later battles take freaking forever between dodging swinging and regenerating specials.
I can see adding another mode to the game: Jenga type mode, where you play against AI (that would have to be fairly decent). Each builds a pylon in turn. The last one to make a successful placement before the tower collapse is the winner.
Pretty decent game though.