So the good news is that this game doesn't track you, doesn't serve you ads, and doesn't cost anything. All around, it's a solid, pretty basic solitaire app.
It's missing a few options, like changing backgrounds, card backs or card styles. The scoring system is kinda weird, but I'm not sure how solitaire is normally scored. There's no Vegas style so if that's your bag, sorry.
If you select to play harder decks, get ready to play harder decks. You will lose a lot.