rolling is a important part of the game cause you don't have guard, but it's useless to have a guard cause you're invincible while rolling.
you can gather close range enemies and finish them all in the same combo, and get closer to long range enemies. Actually be care of the range of attack since you can have a close range with larger range than your, so i would say satart with a long range move.
Not sure if it will work for every one but it work for me.
it's been so long i forgot how to strafe, anyway that's a great game, magnet is really a need since some wave pop at said place it's annoying to have a huge amount of money and no being able to catch them cause the poping don't stop
for the vitamines you ahve to let the vitamine bomb alive so he can drop vitamines.
it's seems i can't acces the level upper right cause there's the primary goal blocking me
We'll look into this.