I'm stuck. Not because of a boss, no, because I can't figure out how to go down this stupid 2D ramp.
 
I am in act 3 of the Kisuke story line, and I can't get past these stupid ramps. There is a ramp slanting down to the right, then down to the left. Where they intersect is the problem. I can't go down, when I turn around to go down, I end up going upwards. It's extremely frustrating. I don't know if I just don't know the magic buttons or whatever. I've tried tilting the joystick downward and going where I want, I've tried jumping crazily, I've also tried restarting the game from my last save point and it doesn't work.
 
Help? ;-;

I had the same problem. I think you press down while you're standing on the intersection. Hope it works.   : )
 
Oh and I just remembered if you double tap down on the analog stick while on the platform above, you fall down through it. I think that's actually how I did it. Hope either one of these methods works.   : )

Thanks! I'll try it. :3