I feel a need to help you out, since I was stuck on this level for many years. First though: I *have* beaten it without cheating and am beating it again now that GoG has it, but yeah it's ridiculously tough. My suggestion for you on that huge 6-part level:
Part 1: Go right toward the exit, since you do not have the grapple power yet. Use the plums carefully, and if you're getting hit by the falling red spiked fruit, try going close then turning around until they fall, so you go the other way. I also don't remember if the huge worm-like monster with a giant eye is in this level, but it is killable.
Part 2: Worst part, stuck here for a long time. Don't be fooled by the moving platforms in the beginning, it's always best to jump right when the first platform (the one you're on) is at the rightmost end of its path.
Part 3: Try to stay to the right, and be careful on the small platforms, since the anti-toons can be deadly.
Part 4: Breather level, go slowly.
Part 5: Boss fight. You can hit him when he zooms at you from left to right or right to left, either by punching when you're on the ground (and he's flying really low) or jumping and punching when he's at head level. Doable, but his health bar is very large.
Part 6: Power time, you cannot fail.
I used the pictures provided in the "rayman cage strategy guide" (google it if you need to) to remember what the levels were, but my strategies are my own. Good luck!