After playing this game on and off for a year or two, I have finally done all the puzzles the game has to offer, and what a blast it has been.
This is genuinely my favorite puzzle game I've played. The controls are intuitive, the music is pretty damn good, the models you build have a lot of charm and there are hundreds of puzzles, ranging from small ones you can do in a minute, to massive builds that take 20 to 30 minutes to make.
There are even giant builds that you make over the course of about 15 smaller puzzles, ending in those 15 parts being put together and seeing them all as one giant structure.

It has boatloads of charm, hours of content and is one of the 3DS's hidden gems.
My consolations to the Americans, who can't get it anymore after the Eshop's closure, since it never got a physical release in the Americas.