You can ace 6 - just don't shoot it as hard as you can. That one takes a little finesse, so shoot the fireball gently at one torch and you can get it to bounce on the other.
The bricks need some friction - there's no damping. The slightest wobble continues. I would be nice if you could let the tower rest and settle, but as it is the lower bricks slowly work themselves out of place.
Nice game, well done and quick to play. However, my achievements are not saved and that is a large part of the fun of the game. Losing achievements discourages me from playing this game.
 "Hands of War"){kind=icon}
 "Scriball"){kind=icon}
 "Castle Clout 3.0"){kind=icon}
 "Achievement Unlocked"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 3"){kind=icon}
 "Pyro"){kind=icon}
 "Scribble!"){kind=icon}
 "99 Bricks"){kind=icon}
 "Zilch"){kind=icon}