This is an absolutely fantastic puzzle game. For those whom played blocks that matter and didn't like the platforming aspect, don't worry, this doesn't have any platforming to speak of. The only related things in the game are the characters and the use of blocks.
The game actually controls through point and click mechanics, moving your character from place to place through just clicking there. The games main focus is using a combination of different blocks which interact with eachother in different ways, in orde to solve a puzzle. Placing blocks involves you shooting them out instead of using the tetronimo mechanic from the last one. Each block has specific functions hinted to ingame once you find them. The game constantly throws new block types at you, as well as special new funtions, mixing things up. They continued to throw new mechanics all the way to the end of the game, and all of them felt well implemented.
You're main objectives in a level consist of two things; getting to the end, and collecting the memory blocks. You can beat a level without getting all chips, but in order to progress to certain stages, you'll need to obtain the memory blocks. You'll also need to 100% a section to unlock the bonus stage for keys to the small boss puzzle stages (using the term "boss" lightly, as it is really a series of puzzles).
The game features no way to die, and if you do mess up a puzzle, there is always an undo button to push things back to where you need them in an instant. The game never felt tedious or boring; always throwing new ideas and puzzles types your way. The puzzles, while challenging, never felt too easy, or too hard. The game also never feels the need to hold your hand at any given point.
The only flaw that I can think of is that there is a bonus challenge later in the game which requires knowledge of the konami code, but it's not required, and is overall a terribly minor flaw on an otherwise great puzzle game.
To me it was worth every single cent. If you are even remotely into puzzle games, I highly reccomend it.