Nothing very new ...
I played this game for quite a while ... so its not so bad :-)
I like the ball rolling and rolling back thing. Way better than defending a town or sth. which you cant repair etc.
As i saw this game the first time, i just didnt want to play it, cause the mobs REALLY look cheap, ugly and boring. Alltogether i dont think your towers fit to those mobs (mobs are like SNES or early PS2 style - towers look like somebody tried sth. with a 3D programm).
Anyway. Maybe you can exchange those images for 2 stars.
Eventhough i turned on my sound - i didnt hear the "music". I just heard the sound effects and a VERY low mumbling at background (could have been my neighbor or cpu-fan). - 1 star
Pretty much advertisment at the beginning - but, hey, its for free xD (i guess it cant be helped).