"Alright, men. You've been chosen because you're the best snipers our nation has seen. Find yourselves a safe hiding spot, and take out the enemies before they can pass you."
"Hmm, this highly flammable barrel of gas seems like a good place to hide..."
I love that if you mess up in the Plus puzzles, it doesn't automatically tell you where. That's always been my biggest pet peeve when playing those kinds of puzzles, but the way it's played off makes it so you understand something's wrong without being obviously given the answer c:
A tip for those going for the hard badge - if you put your window on only one half of the screen, you can draw out a good fifty or so shapes that you might struggle with on the other side. Things like the alphabet and certain symbols should come easier, but I personally find it really helpful when, say, I can't remember that the lips look stunningly similar to a heart.
It's very tedious, but for those of you looking to get the hard badge: Get the bare minimum of armour and regeneration, with whatever else works best for you. After each wave completed, avoid the soul at all costs by walking in circles until any health or armour lost has been recovered. It'll take quite a bit of time (and possibly a few tries), but it's well worth it to have full hearts with those later waves.
A nice tip for when things get stressful in survival mode - the higher the floors built, the more effective a soul jar down the center seems to be. Very helpful when those blasted prophets are draining your mana.
Ugh, stop badging P2W games - and at the very least, /don't/ put them on the first page of badges! The medium badge takes longer than some hard badges I've seen.
 "Battalion Commander"){kind=icon}
 "Shift"){kind=icon}
 "p.i.g"){kind=icon}
 "Paladog"){kind=icon}
 "Don't Escape"){kind=icon}
 "Picma - Picture Enigmas"){kind=icon}
 "Penguin Overlords"){kind=icon}
 "Viricide"){kind=icon}
 "Picma Squared"){kind=icon}
 "Infectonator : World Dominator"){kind=icon}
 "Z-Rox"){kind=icon}
 "Little Red Riding Hood"){kind=icon}
 "5 Differences"){kind=icon}
 "Reaper of the Undead"){kind=icon}
 "Cat God vs Sun King"){kind=icon}
 "Mine of Sight"){kind=icon}
 "Pixelo"){kind=icon}
 "Dibbles 4: A Christmas Crisis"){kind=icon}
 "Tower Keepers"){kind=icon}