I'm playing through the Steam version on "Casual" mode and it's still pretty difficult in a few spots.
I'm stuck on Stage 8. There's a section where you have to climb to the top of the screen by hopping on platforms while something that appears to be a swarm of demon-bees races up from the bottom, destroying the platforms as it goes. It doesn't matter which character I use, I can't out run the demon-bees. I've tried at least 20 times so far.
I'm using a PS2 controller on my PC through a "Twin USB Gamepad" adapter and I'm wondering if I'm getting killed by lag or something.