The game has two parts, with the main puzzle game portion and the Moomin World decorating portion. The main puzzle game is simple enough, as it's a match 3 puzzle where players just match three or more squares of the same colour and eliminate it. It's fun, simple-to-understand, and a great time waster.
However, the most fun I had in the game undoubtedly came from the decorating portion. I don't know, just decorating stuff soothes me easily, so this is really my favourite portion overall.
As a puzzle game, it doesn't really stand out, as its mechanics are pretty common. However, the game makes up for it with the decorating portion and a simple story. And if you're a fan of the Moomin franchise, this game is definitely one you must download.