Background looks great
Music is really nice, even if it probably needs to be balanced a little (especially with the credits music)
The battle needs some feedback (for attacks etc)
You also need to tell the player the card effects (even if it's on your page)
This kind of card game relies on strategy, and it doesn't seem like there is any strategy right now
There's also a little bug when you drag cards
GG for the custom engine though!!
That's impressive
The game page is also really nice