These two remain, time for another hint;
13: Spend your Magic Potion strategically.
Hint 2: Though each of your regions needs at least one, it's a better idea to distribute it all along your border. Guessed by Darashiva - Astérix (Asterix: The Gallic Wars)
11: The big nuisance in each level of this game is also a shooting mini-game.
Hint 2: In the regular levels, the holes that spawn the individual nuisances can be 'deleted' by placing something in front of it and removing it again. It's probably a glitch.