I like this card game... but this app seems desperate for money. It costs so much energy to play. Each round cost 5 energy when there is 6 rounds per level you can't afford to finish 1 level and then you have to wait 5 minutes for 1 energy. That is 25 minutes to play one round. There is no option to watch an ad to play. It's almost half an hour for maybe 2 minutes of game play. $2 buys only 30 energy meaning it would cost someone $2 per level if if they spent real money to not have to wait.