That's great! One other bit of feedback - I think the timing for picking up the full stack of cards by holding A could be sped up a good bit. The Playdate's buttons are snappy enough, I think most people are going to be able to single-click for a single card without this causing any problems.
This one is more of a value judgment than a bug report, so I won't be mad if you disagree and keep it the way it is, but I thought I'd throw in my 2c just in case!