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Nice game, but the difficulty level is way high, it's very hard to make any progress at all towards a completion without (rather too many) balls sprogging into the play area and covering up all your good work. It'd be nice to feel that element of strategy more often without having to be both lucky and a total ninja at bouncing awkwardly colored balls off walls onto the back of the cube.
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It's a great concept, nice clean gameplay, but doesn't really change at in any rewarding or substantial way after you clear a level. I was sort of hoping for different shapes, multiple hubs, or something like that. A score bonus doesn't really compel me when playing on Kong doesn't even save high scores.