Thanks for reviewing our game! We're really glad you liked it!
Yeah, the player UI took a lot of iteration and even now we're not completely sure what control scheme's the best. We tried hotkeys but thought that it added too much work to the hand that was already occupied with movement and dashing so we gave card selection and aiming to the mouse. We'll also try your suggestion about the card placement, it seems like a good idea, and maybe also increase the base thinking time to compensate for the details the player has to keep track of. We'll also crank the particles down a bit to make attacks more readable.
Thanks again for the feedback!