This was a pretty fun kids game, and is also very easy to unlock the achievements. Most of the short little levels are very linear and don't require much thinking at all. A 6 year old could beat this game.
Most of the main characters are here from the movies, and it's got the funny lines and all that good stuff. It's a fun game, but way too easy for someone my age.
I would say it's a very safe solid rent for any kid 6-10. Not much replay at all other than you can go back to any level you've played to either replay that level or get the crystals hidden in each.
You basically run around, collect berries scattered in the levels and those fallen from your dead enemies, and complete little 5-10minute short level missions.