I love STS and I've played ~6h of Balatro.

It isn't clicking with me like STS did. STS has tons of flavour and variety, but Balatro's main flavour is "poker" with some surrealism on top. The gameplay mostly has you staring at poker cards and thinking about how to stack point multipliers with jokers. It felt pretty monotonous to me after a while.

Balatro is definitely fun and worth its price. Give it a shot if you like STS. I just don't think it's the second coming of STS like a lot of people have been saying.