Your game is great :)
I agree with CrowesFeet, maybe you need to add more option before battle.
For combat system, blocks are actually pretty weak. Maybe you should add (success hit + sucess block) - (ennemy success hit + ennemy success block), then the difference hit your ennemy (or you). I may bring more strategu about picking cards.
The shuffle part of the battle is pretty original and fun ! :)