Plastic Shield perk makes evading 5 bullets in a row almost impossible, and there's no way to turn off that perk. I finally had to do it by dashing through the bullets of two gunmen who luckily (after many tries) were firing at the exact same time.
I think the idea is good. I think it's ridiculous that to get any kind of power-ups, you either have to play tons of matches or pay money. It forces you to pay basically... STINK
i think the tower shakes because of the impact of the falling pieces. to get impossible, don't just try to fit pieces, try to lock them all together... and build the tower wider than 8 blocks
great game. everyone needs to quit crying. it's not impossible. just figure out where the best place to put certain towers is and don't be afraid to use tacks if you need to.
 "The Final Death Wish")
 "Mechanical Commando 2")
 "Robot Wants Kitty")
 "Fantasy Kommander")
 "Drift Runners")
 "Bible Fight")
 "Dinowaurs")
 "Super Stacker 2")
 "Pyro")
 "Mytheria")
 "99 Bricks")
 "Storm the House 3")
 "Bubbles 2")
 "Postal Panic")
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 "Bloons Tower Defense 2")
 "Desktop Tower Defense 1.5")