Fan of puzzles ? get this one !
Don't be fooled by its childish looks, it will require some deep thinking if you want to finish it fully.
The difficulty scales pretty well, and some levels require quite a lot of time to be passed completely.
Each level has 3 "stars", gained by finishing the level, in a limited time & with a limited number of moves. Sometimes, there is also a "gift" to collect on the way. And the solution you find for one of these will not be necessarily work for the other (especially, collecting gifts often use a different route than the others).
In total, you have 75 levels (a few levels are merely tutorials, though), but you can consider that you have more if you want to finish the game at 100%.
All in all, a few hours of fun, with a relaxing soundtrack.
To sum up :
+ Good scaling difficulty
+ Some levels need to be beaten 3 times in a different way to get everything
+ Special levels to unlock in each world
+ 3 character skins, which can be customized in a funny way
- Missclicks are common on the game items, each one forcing to restart the level when trying to complete the game (thanksfully, it's restarting fast)