I dont get why people complain about difficulty. I skipped the tutorial ("meh, TD, what could go wrong?") and am now at Minarth without loosing or replaying a level even once. Great Game. Also, I like how the Soldiers operate. 5/5. Start Wave button would be nice though.
Please, for the Giant Spaghetti Monster's sake, add a clue at the level selection so the player knows if he has already abduc... erm, saved the princess in a level. Otherwise, a really fun game! 5/5
Check Point.