I've noticed a glitch you may wish to patch. When jumping against a wall spamming the a button with jump results in a climbing process. I thought this may be some kind of "skill" jumping style you planned for. But when i fell off the entire map from doing this, I figured it's not the case. Thanks and I hope you fix this soon.
It took 40 mins of hell but i got that achievement... + an extra 176 seconds o.o
P.S 10 balls = insanely hard 11 balls = totally nuts. Don't know the last 4:P(You post em :o?)
 "Culmination"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "Love"){kind=icon}
 "Particles"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 3"){kind=icon}