Loved this at first but now I am constantly having to email developers because they do not reward me for In app purchases. They ask for screenshots and totals which I send right away , then I get no response for about 2 weeks if I get one at all. Kind of odd that it happens when I'm close to having enough gems for a card. If I didn't pay attention they would get away with not rewarding me anything. Also they don't give any compensation for all the time I have to spend constantly contacting them