Bug report: Clicking the deck before the opening animation completes can freeze the game; I wonder if this is caused by the same issue as the bug another commenter reported on "select next deck" screen.
My game usually crashes from lack of memory before completion :'(
On safari, quickly dragging a card to the center doesn't play it; the card falls back to the hand. Only dragging it to center and waiting a moment allows cards to be played consistently; this is true whether you drag it to the highlighted center of the board or onto the enemy.
Very fun!