I was like "this game is so hard ! I can't imagine the last boss ... " and then I read the comments and tried the first hero and then "call of duty" and summon all the units ! And then it was too easy ... But great game ! ;)
Music is pretty awesome :D other than that, it's funny to have some terminator penguins to kill the turtle invaders. Awesome game ! And for those who wonder, I think the AI is voluntarily made that way :p and yeah, if we could upgrade money collecting power, it'd be great !