Aw, yes, I should probably also post to a godot community here :)
I'm always eager for feedback. The next release will probably include some balancing updates, and I'm thinking about adding different modes to suit different tastes. If you have any ideas, I'm all ears!
I made one! It's a solitaire-like but with some new mechanics, and fairly polished and balanced at this point. You can find it on itch and on the play store. Here's the source.