It's not really that fun in general.
That muncher on that next jump is too much of a pain to avoid.
So's this torpedo cannon, and the jumping koopa immediately after that killed me frequently.
And, finally, are these torpedoes supposed to just come down and cheap-shot the player? That's really the only purpose I can think of for the disco shell in that tight corridor you can't reach, but either way, that's not the best way to make a stage difficult.
And I agree with the other people about that vertical room, though it didn't give me much trouble. It's just a long series of blind jumps that isn't particularly interesting.
I haven't played Nin's half to see if this second section actually fits into the first, but to be completely honest I didn't enjoy this at all.
EDIT: forgot to mention but in the second half you have a mushroom block on layer 2 and it looks really ugly when it comes out