I do not care for the fact you reset the Stars to zero, and I do not see the advantage of getting stars (before it would improve your hero abilities), but that is the only issues I have at the moment.
Suggestion: When in the battle, have a better indicator for when it is your turn or not. I joined an Async game, and it was not clear that the other player was going first.
Besides energy increase, I would include a why of sorting the cards when building your deck. Sort by turn until active, attack/defence power or special abilities. Sometimes I am looking for one thing to add, but I lose track looking through all the cards I have now.
Oh, new look to the game. I wish the opponents score was still at the top, was easier to figure out how much I was ahead or behind.
I am tired of people complaining it is rigged. It is not. Work out the statistics and you will see.
While I liked it at first, I finished the missions & challenges and am disappointed. I only died 5 times. Should have had a campaign mode or something. I was thinking, you start with a 60 card single color deck, and can pick which of those cards to play with. Every time you win, you can add three cards to your pool of cards (picking from cards your oppoent had) and every time you lose, 3 cards are removed from your card pool. That would add replay value to the game.
Seem like it would be good, but I would put items together that added up to 9 and they would not register and clear. After several of these occuring, I got tired of the game.
Game is simplistic, and the attempt at a memorial or social message is not successful. Not sure what you are trying to do, but over all, the game is not worth the time to play.