This is a rather addictive and fun card game, but the energy aspect limits the players' fun to around 5 minutes or so (notwithstanding Arena). As a developer, if you truly want your players to have fun, then please nerf the energy handicap so that players can enjoy the game for a longer period of time without any interruptions.
The auto targeting system is kinda fail. You should at least make it such that anti air units attack flying units. If all attacks are decided by AI (which is super dumb, by the way), then I don't see any strategy in this game.
@QuantumT
The energy system is not meant to stop people from playing the game, it's meant to get people to come back more often. If you're really hooked to the game, nothing will stop you from playing it.
I suggest adding cards which reduce the number of turns you need to wait for your other cards to be activated.
Also, the ability to select which enemies your units target rather than just auto-targeting would be great. This would improve the strategy aspect of the game.
Sometimes after I play a card the game just freezes there and doesn't respond, though I can still click the fast forward buttons. It's not a hang, I don't know what it is, but I'm guessing its due to the poor coding as above mentioned.
This game is so awesome in so many ways I can't describe all. Graphics are good, puzzles are fun and not frustrating, story is great and thought-provoking. I don't see why this still doesn't have badges.
Good game, but interface is horrible, and the game is also very slow paced. I don't understand you have to go to the browser just to tear up your cards, and more importantly, why can't your cards stack so you can see multiple cards of the same kind. The game also froze once when I was playing halfway, and I have to squint sometimes because its a little hard to see stuff; you should have more bright colours. Overall I can see that a lot of effort has been put into this, but still it requires a lot of polish. 3/5.