The game was very creative with it's idea of combining a series of two or more numbers to achieve a certain end result. The levels are increasingly challenging as you go on, which makes getting a higher coin value rewarding. My only problem with this game is that it became boring after a while. Nevertheless, it was still a great experience for the first 10 - 20 minutes and is a great time killer.
Thanks a lot for your review.
In order to add some variety to the game, you should try to unlock the other characters with your coins. Each characters plays very differently. For example: the Plane need a lot of space to turn around and cannot stop; the Turret cannot move and so you have to shoot at coins to collect them, the Teleporter can move anywhere instantly, the wizard doesn't need to "shoot": click on a ball and it'll catch it instantly (that's magic!); the Spaceship behaves exactly like in the good old arcade game Asteroids, etc.
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