I posted a review on the game's site here on GOG, but let me elaborate on some points.

Kid friendlyness: I'm torn in this regard. The art style is quite beautiful and the overall design is surely aimed at kids. Most of the puzzles are also quite easy, mostly because you can only click some spots at any given time. So, most of the puzzles can be solved by simply trying out your options. There is, however, a colour puzzle that could be quite confusing for kids. You certainly need some knowledge in how colours are mixed. This puzzles get repeated throughout the game. That said, there are some puzzles involving machines without giving you many clues as to what they do. I guess, kids could get frustrated with that.

Story: Sadly, there is no story. You don't learn anything about Lilly or her brother (or even that this kid is her brother at all, it's only said in the game's description) or the world. There are no other characters to interact with and no dialogue or even just plain text. In the final screen (of only a mere 10 in total) a new character is introduced and then the game just ends. I was very disappointed and as a kid I would have been furious, I guess. You just have the feeling that you accomplished nothing.

Puzzles: As already stated, the puzzles are either easy or the colour puzzle (which gets easy after you "get it" and is just repetitive after that). There was the chance (and obligation) to use the goggles to make some great puzzles involving changing things in the past that affect the future, but those puzzles can be counted on one hand. Even if you're a Disney character. For a game that encorporated this theme in its title, this is unacceptable.

I'd suggest you rather play more of the Lego games (the new Marvel one is awesome and should be a hit with your kids). Another one that can be played together is Ibb & Obb. It's plattforming but great fun.