Ive been loving this game. Its a card game with lots of depth to the optimization and some RNG but its not overly punishing. If youre looking for a fun casual game try it out! Its less than $10 on sale right now.
I love slay the spire!
Have recently been looking for games with a similar experience/core gameplay and came across Vault of the Void. I can really recommend that game of anyone is looking for something kind of similar to Slay the Spire. Although I'd say it's a bit more relaxed and definitely more colourful.
Monster Train is also a really, really enjoyable deck-building rogue-like. Not sure if I like it more than StS, but it's awfully close. I ended up getting it for iPad and it's great to just pop out and play whenever.
I'm really enjoying Wildfrost. Sort if similar to monster train. It's cute and insanely hard and punishing. Unfortunately it's only for pc and switch currently.