I was gonna comment about the screen sizing, but you addressed that on the page haha.
but wow! good set of cards and quick to pick up battle mechanic. It did take me a bit to get a handle on, but once I did I found myself playing quite a few rounds (17 is as far as I got!). The card animations are slick, and the sacrifice boosts are genuinely useful. well done designing and implementing them! I'd be sure to play again if you plan to iterate on it.
would really appreciate if you can try my game out too :)