How to beat almost every level: Make a basic tower line, and then put an area burst tower in a good location, skip levels until you max it. skip more and have a attack speed boost next to it. make another maxed burst next to the maxed speed boost. put sniper towers in/ ghost if ghost level and you win.
o_o that took longer than i expected lol freaking awesome game =P minus the part that i cannot kill the snow man or the snow mound since i go past them in the first second of lift off.. XD
wow that yeti looking boss was tough it took me at least 10 min to kill it, you should make it's heal less cheap.. even though i am a battlemage (i used warrior armor =P)