Slay the Spire is one of those games where the more I play it, the worse I do. I did better at this game when I didn't know what I was doing then I do now after hundreds of hours in the game.
The key is ALWAYS (almost) paying for card removal at the shop. I plan the path I take by looking for the one that hits the most shops and always remove a card.
I guess… I found the card game itself to be kind of bland. However, I will say that I never finished the game, and without spoilers (I honestly don’t really know specifics) I understand things get… Different. So maybe it gets better
Just as an alternate opinion, I found the actual card game itself, in Inscryption to be a bit shallow and bland. The most compelling part (of what I played, admittedly), was everything but the card game itself.
Your mileage may vary.
I will just say, if you’re expecting a deck builder card game like sts, you might be disappointed.
I’m not sure it’s the best rec for someone looking for another sts.