I can't believe what's happening with the ratings of this game. Obviously most of the people didn't play more than 5 levels, and apparently they didn't understand the game.
First, this game would be better categorized as a puzzle.
Second, the game is hard. I would like to see the people that say it's easy playing levels 24,25,26 or 27.
Now lets go for the review itself:
As I said, except for the tutorial levels, the rest of the game offers a challenge based on thinking before moving.
The gameplay is based on the use of "magical squares" in which you can create explosives by making a combination on them. With these explosives you can destroy some objects such as the ice or rocks, which are two of the challenges of the game.
In every island (20 levels) there are 2 paths two follow with 10 levels each one that end in a boss level, usually with the feature introduced in the island.
The variety of objectives goes from obtaining quantities of gems inside a "pink zone", destroy the ice by matching jewels nearby or with explosives, destroying barriers between jewels, destroying rocks...until level 45 which is the last one I've played.
The boosters are unlocked as you progress, there are supposed to be 5, with different power versions of each one.
You have a number of movements to finish the level which makes it quite difficult...people complaining about that what do they want? A mindless game?
Also the diagonal matching would make no sense in this game, the combinations would be too easy and would break line blast creation.
It seems most of the bad ratings come from people who doesn't like this type of game...the only thing I agree with them is that there should be reshuffle and that the tutorial is a bit boring.
In summary, if you don't like match3/puzzle games, like diagonal matching, like easy games...this is not your game. For the rest of people, try it yourself beyond the tutorial.