Pretty decent game, there is an audio off switch which is a plus for those of us who prefer our own music to this patriotic theme.
Game play is all right... it gets moderately repetitive after a while but once you beat a level and get upgrades your set 8D.
This resembles GEMCRAFT and DESKTOP TOWER DEFENSE. It follows the same format essentially where you get normal fights for a few rounds and then a boss fight, followed by the monsters kicking it up a notch.
All and all... 4/5...