Finished it: they won 1-3, code 245432.
Genuine feedback, since that is the point. The loop works and the one-card-breaks-the-rule hook is a good pitch. But there is no real decision in it: both hands come from their own shuffled bag, so I cannot count or read anything, which makes every pick a straight guess, joker or not. I never felt I could get better at it. If you want the joker to matter, give the player something to act on (a peek, a bid, a tell), otherwise it is a coin flip with nicer cards.
One real snag: I hit the exact thing 7Fall did. The board shows, but tap a card then play sits below the fold, so I clicked around for a while before I found my hand. A taller default stage, or scrolling the hand into view on load, fixes it.
Code received: 245432. Final score 1-3.