If you read comments before playing, don't bother with this game. It will only let you play to level 19 before demanding money. if they were planning on monetizing through micro transactions they chose the worst way to try it.
We heard your complain and updated the game: Now you just need to have 3 Stars in all the levels to play for free forever. It’s a bit challenging, but at least you are not compelled to pay. We hope you will be happier and give the game another try (maybe give us a better review?).
I found a glitch! If you restart a battle the game returns your research, this includes the research you spent to unlock towers. I'm on the 3rd level now and have all the towers unlocked. I'm happy, but I don't think you guys intended it to be used like that. :)
it would be nice if there was a low resource setting as well, every time I try to use "rain" on a wave over 25 my flash player crashes. I wouldn't mind so much, but I need the spell to pass wave 30 on the second map without losing any lives. :(
 "Mana Crusher"){kind=icon}
 "Swarm Defender"){kind=icon}
 "Hordes of Hordes"){kind=icon}
We heard your complain and updated the game: Now you just need to have 3 Stars in all the levels to play for free forever. It’s a bit challenging, but at least you are not compelled to pay. We hope you will be happier and give the game another try (maybe give us a better review?).