this was way too easy. The levels should be called very easy and the other one was just stupid, adding a timer that never goes near 0 before you finish a level.
But i liked the game, just needs harder levels.
after wave 350 or something i didn´t get anymore cash, so i just let it go, and went to do other stuff. I checked i sometimes but it took to long time to just sit and watch. then on wave 750 i pushed in some waves at the same time, then i lost.