I bought the disable ads IAP but the ads still pop up in between the levels. A nasty bug, though I'm sure they will fix it and in that expectation, I will not subtract stars. What is important is that the game is ok. A physics puzzler, not very difficult but nice graphics and solid physics. The animations in between levels are suffering some performance issues (on my iPad mini 2). And the score is not shown when finishing a Level. All in all, as I like this type of game, to me it is worth 4 stars.
[update] the ad disable bug is fixed
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