zomg i had done level 3 on hard mode and suddenly 2 dozen mighty gaudians appeard and i couldnt get close enough to kill them it was crazy!!!!i dont know why it got so hard suddenly
you need slower things to kill the boss and max armor for buildings and repair maxed too.then stuff can repair thats been hit by the boss while the slow stuff gets them and you fire.i also made my damage full for him.I beat him easily with all of it in two passes
would be even more fun with multiplayer and make it so you can make uber cannons like the one in the doragons lair.also you could make a level creator for it too.i think this game is fun