Pay a visit to additional purchases, or how?

Either I'm stupid or app. Gladly we must teach me, but after the first - admittedly very amusing Try with the cute bonbonmampfenden Monsterchen - I wanted to play one day and later? It did not work! They offered me any in-app purchases in order to "unlock all levels". Yeah, thanks, but no thanks! I refer not free app, but then to be paid the next day what for. Or did I miss some hidden button, with which I could continue playing but ... np! Whatever this thing is flying from my Kindle and tranquility, there are plenty of really good apps without further Zasterabdrücke, then the Monsterchen has just starve me. Too bad!