the way i did it- save up for a frost sword. using etinette (or whatever his name is), use mattesp's shooting technique. i didn't even get a killer shot, but i got three power smashes. it's actually okay if you don't use them all at once, wait until you slow down. oh, and keep holding right. i've noticed that the right-click thing lags the CPU.
the easy badge is pretty easy, but the hard is almost unreachable, let alone the impossible. then again, if it wasn't, it wouldn't be much of an impossible, now, wouldn't it?
"general, I'm having the strangest feeling that someone's watching our every move..." "nonsense, Lt., now let's have a turret sprout from the ground and lower those strange numbers above the floating inanimate objects' heads. hopefully, they won't reach the base and make one of us randomly vanish."
lol- if you're going for trophies, play in survival mode. that way you can save them and still keep going. one thing, though- for the impossible, is it easier to play in arcade or survival? survival can keep the game easy and progress faster, but in arcade, you're not tempted to use the doors and get all the gems above them.