Well, this guy seems to have included a lot of extra features that players commented about, so +1 on that. Still waiting too long on game over screen if you are trying General mode and die in the later levels. To me the sticky shield is relatively useless since you just have your mouse over the enemies. Get homing rockets as soon as possible, then explode damage. Then buy interest and damage reduce for rockets and fire missiles.
Still needs a little more variation in the music, and some changing of the "base", perhaps the tanks and the ground. Having to play all 3 difficulties, if you finish the General one, you should get all the easier badges/achievements ;)
Flame yourself like in the training video, nuke yourself with the microwave, go downstairs, get an umbrella through your chest as you make your way to the science lab to get killed by axemen. They have 5 attack, 0 armour and 50 HP, you should have only 44/100 by the time you get there.... ;p
Cover the ground in trampolines and make a buzzsaw bathtub with more buzzsaws on the roof, the roof also covered with turrets. Use 7 proxy mines spread along the floor so you get the entire floor of turtles. 30,000 hits per 10 seconds! ;p Start with trampolines and turrets first...
Everything is maxed out, I've got the BF badge but I can't find the end boss. I also can't be bothered killing unit after unit of crap, now easy to kill things, maybe that's why. I don't know. Actually I think I may have found it once, it filled the entire bubble, but I was only on level 3, so I ran away... :o It's probably still there in the distance waiting for me...
 "The Soul Driver"){kind=icon}
 "Shield Defense"){kind=icon}
 "Five Minutes to Kill (Yourself)"){kind=icon}
 "Epic Combo!"){kind=icon}
 "Crush the Castle Players Pack"){kind=icon}
 "Bowman 2"){kind=icon}
 "Toss the Turtle"){kind=icon}
 "Multitask"){kind=icon}
 "Crush The Castle 2"){kind=icon}
 "Bubble Tanks 2"){kind=icon}
 "Shopping Cart Hero"){kind=icon}