Insane number of ads
Ad to start a level. Long unskippable ad to claim the stars for each level, which doesn't seem to be able to be done in bulk. Ad at the end of a level. Basically, if you click on something, there's an ad. Can't be played offline. Disgusting. The dev may respond that they need to be able to support themselves, but all they've done is make me nearly immediately stop playing. With less ads I would have played much longer and they would have made much more in the long run. Now they get almost nothing.