itch.io

The Itch interface is kind of confusing. It says you can't add something to the Jam, but that's because it's already in there (check Submissions and sort by Recent)

The Unity Default Cube probably would be less fun, but your thumbnail does make a convincing argument

The most difficult aspect would be to rework all the controls to function with just a touchscreen, which means there's no mouse hover and no right-click

Maybe you could make it so your streak doesn't reset if your very first move is pressing the Redeal button

Signing Solitaire Mystery with the default LOVE2D runtime bundle on macOS can be done within minutes, but if you're planning to add Steam Achievements it might take a bit more time to make those work on macOS :P

This game was made with LOVE2D, which can work on Mac if you do this: https://itch.io/post/9819297