Thanks for the feedback! I'm glad you enjoyed it overall. I think the animations definitely need distinction, the card either moves straight across or at the tower; it definitely doesn't help that all cards move at once and that the opponent's turn happens so quickly. I think I spent the last 2 days fixing bugs for the opponent and trying to balance them, it kept yoyoing between way too easy and way too hard; this was definitely the hardest bit. I think the game play would greatly benefit from a wider variety of cards as well as a larger variety of effects. It would also greatly improve with a smarter opponent with more restrictions.
I am very happy that someone played it with such a critical eye to recognize the shortcuts that I took -- especially while still enjoying the game despite these shortcomings :P. I don't plan on adding more to this game but I am rolling around some ideas in my head for another card game that I am hoping I can take my learnings here to implement.