The switch in controls sucks, the droning voice is pretty shitty, the songs aren't nearly as good as the other one... It had been going great for SCGMD2, but it got really screwed up on 3... 2/5. Re-do it and keep some of the qualities of 2.
There should be a new one. Better graphics, better base upgrades (wall, barracks, towers, turrets, hired arms, you know)... A few new guns wouldn't hurt.
Very good game, although I'd like to see 2.0 (more towers, different enemies, different play modes, more upgrades, etc). Cr8zy, I know I haven't beaten it on frost & splash, although I've tried it at least 50 times, with different configs each time...
Here's another thing you can do: When you have the barrel upgraded so it deploys mines when it explodes, place 3 barrels infront of you. Click "z" for your shotgun and shoot once, then quickly click "x" to go back to the barrels and keep clicking space. The additional blasts from the barrel 'nades will trigger the barrels you place, and with 40 barrels at a time, this can destroy hundreds of zombies. You might not run out, either, because of pickups.
Btw, hey, just registered :)