I love the Papa Sangre series; it definitely gets your blood pumping! lol
With that being said, I have a few levels which are frustrating me in both 1 and 2, but for the sake of time, I'll just post those related to Papa Sangre II.
The two levels I keep getting stuck in are Dial 1 For Abyss and Thunder Hogs. In Dial 1, I get all the way to the point where the Forgotten Man comes, but he keeps getting me before I can even get to the entrance. Sometimes, I come very, very close.
In Thunder Hogs, I only move when the tunder booms, but when I destroy the music note, the hogs automatically charge, so I can never get past the first note.