This is a top quality Playdate game and lots of fun! Thank you so much! :)
Just echoing 2 pieces of feedback others have given already, played with the beta:
- It is possible to place any card on an empty space, not just Kings, which is against the rules. (As mentioned by Raccoon Formality)
- The "Move cards up" via crank could be given as a hint when you are left with obviously solved stacks. In our initial games we forgot about the crank and didn't read the help of course. ;) (As mentioned by Domedin)