Just wanted to drop off a bunch of ideas of improving the UX of the game, as I played with it recently:

• Make it clearer when someone wins a game - e.g. display information message on the table area
• After automatically starting the next game, it's a good idea to clear the cards on the right or at least show clearly that they are cards from the previous game
• Make it more clear how to close the deck, i.e. by double-clicking it (a tooltip for a hint?). Maybe ask for confirmation in a popup.
• Add an animation when someone plays a card, to make it feel like a real game
• Deck should be non-transparent
• Don't use large-sized cards on the left & right, it's kind of ugly
• Opponent always seem to play with 6 cards, even after playing a card or even at end of the game
• Better visual indication when playing 20 or 40 (which goes away automatically)
• Show visual hint that you can play 20 or 40 (e.g. with a tooltip on the Queen and King)

Scenario: AI plays card, UI player plays card, UI player has access to the card AI played, so he can store (in real game you can track the cards passed, some sort of counting), but AI player can not access the card played by the UI player.

In two words the second player has access to the card which first player played, but the first player should receive some kind of notification which card the second player played.

https://play.google.com/store/apps/details?id=com.karamanov.santase&hl=en