With a clever design idea, the game presents its mechanics right on the title screen:
When a hole is filled by an ice block, other blocks will slide over it. The one limiting rule is that to release the ice blocks from a tile, there must be enough empty holes to accommodate all the blocks. If that isn't the case, a red animation indicates that the move is not allowed.
Other game elements include arrows, which make the blocks do 90 degrees turns, and blocks with a handle on top, which cannot be passed over by other blocks.
The final game element is fire blocks. When they slide over an ice block, they melt it, and leave an empty hole that needs to be filled again. This significantly increases complexity.
There is only one way to solve each puzzle, which gives a nice feeling of achievement.
As the game progresses, the solution to the puzzles becomes more complicated, but it never seemed excessive in the levels I played. Logic will help a lot in figuring out the correct order of the moves, so as an extra challenge you can try to avoid experimentation and attempt finding the solution on the first attempt.
The game has 100 levels to play initially, and additional 26-puzzle packs available through in-app purchases. The puzzle packs have names like "Nature" or "Mist", but this doesn't seem to obviously translate into a theme common to the puzzles (or at least, I couldn't see one).
New puzzle packs are promised on a monthly basis, which should guarantee longevity—provided that you are willing to pay. I think only 26 puzzles for each purchase might seem a bit too few, and would appreciate if the developers added the ability to bulk purchase multiple packs at a discount. Still, I'll probably buy some additional pack when I finish the first 100 levels, because the game is fun.
I hope new game elements will be introduced in future packs, otherwise the puzzles might become repetitive in the long run.
For the technically inclined, the blog and the Facebook page also contain some interesting behind-the-scenes information about the design and development of the game.
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