@rich: The output is capped at 32; having a higher production rate will not do any good. And you don't destroy the emitters; you can cap them off (having a blaster close enough to keep it from spewing forth), but you can't destroy them. You probably already know this, but in case you don't, you beat a level by connecting to the totems. If you want to destroy emitters, try the Creeper World 2: Academy game.
Some of the changes are fun, but the bugs and awkward menu system are an issue. Ghost targeting is still a bug. You should be able to start the next level using the current game type and difficulty level selected. Also, completing a round on a harder difficulty should award all easier difficulty level points.
As many have mentioned, ghosts sometimes don't get targeted. Also, when a mega tower is created with a laser, it will occasionally stop firing and you have to sell it and rebuild it.
 "Royal Offense"){kind=icon}
 "Creeper World: Evermore"){kind=icon}
 "Nano War: Mobile"){kind=icon}
 "Bubble Tanks Tower Defense 2"){kind=icon}
 "Bubble Tanks TD 1.5"){kind=icon}