I'm ashamed to admit, but I was broken by Beppo's Hole. It'll take a stronger man than me to make it to the top. The art is excellent, the portraits are a nice indicator of where to find the next platform but... gaaah, I just could not deal with the jumping sensitivity and the regular plunges to the pit of despair and also of meatballs. In addition, the double jump mechanics took me a bit of time to work out - the earlier you double jump, the greater the boost. Huh. Interesting.
Would like to see more. Especially an easy mode, for the humans among us? =)