It's a significant step backwards not only from the outstanding "Rayman 3" on the system, but also the development studio's rather impressive conversion of the original side-scrolling platformer back in 2001.
While replaying completed levels to raise scores and collect more lums will unlock secret areas, the core simplicity of the gameplay may not tempt many players to romp again where they have romped before.
A game that could have been great. But due to the glaring control issues and lack of player rewards, it becomes a chore rather than a game, and most players will probably be bored or frustrated if they bother to play it.
Simply put, it has no hook. It offers nothing of interest to an even semi-seasoned gamer. It's as dull a foray into platforming as you'll find on your local store's shelves, and another unfortunate example of this license being diluted.