To max out all the jewels or whatever is HARD.
Those ending levels are wicked tough and you basically have to die and die and die and die until you memorize the exact moves you need to make in order to finish with full points.
This is a nice surprise in such a casual iOS game (and totally reflective of the challenge level in the console versions).
So, yes. This game is great. Just tough if youre a completionist!
Greggsta about Rayman Jungle Run, v1.3.0