It's a pretty interesting little puzzle game, and I like how challenging it gets to be.
The graphics provide a nice layer of eye candy, with colorful tiles and vivid animations, and the mysterious music adds a nice tone of, well, mystery to the game. I'm a bit sad that the adventure mode does not, as the name would imply, include any story at all, so I had to fill the story in with my imagination, and it became more and more macabre the more frustrated I got.
The gameplay mechanics are pretty interesting, and unique for this kind of game as far as I know. You release tiles that can only move one way. If a tile collides with another tile, it gets blocked, and once a tile has its moving direction unblocked, it moves in that direction. Once you get a contiguous region of three or more tiles, the tiles get destroyed. The objective is to collect special gems by breaking the tiles containing them, in order to move to the next level. As extra features in each stage, you have randomly appearing arrow tiles, walls, teleporters and intrincate gem patterns to unlock, adding tension and challenge to the adventure mode, which only makes it all the more satisfying once you can finally break a long chain of tiles.
The one gripe I have with this game, and that annoyed me quite a lot, is that it depends a little too much on luck. Since the tiles that are given to be placed, as well as the tiles that are randomly generated, are random, I often saw myself getting frustrated time and time again when trying to solve a stage by getting very unlucky sets of tiles, and then, out of pure luck, I end up starting a stage with such lucky tiles that I can finish it in very few moves. Luck in this game will define whether you're gonna fill your board with tiles before you can get that "damn final gem" or you're gonna be able to solve the entire thing in a single sequence of perfect moves.
The luck factor killed a lot of the enjoyment for me, but not to the point where I'd consider this to be a bad game, so I'll give this a 4/5.