Given Slay the Spire's popularity around these parts, I'm surprised I haven't seen more mention of Monster Train. Northernlion seems to be enjoying it and has an ongoing series up on his channel.
I've played a couple of hours and I like what I see so far. The similarities with StS are obvious but it does enough to differentiate itself. The story is slightly ridiculous, but the art is delicious. Personally, I found the art of StS rather off-putting. Monster Train is a significant step up in that regard. It's hard to tell how much legs it has but my first few runs have been a lot of fun!
Give it a try, it's 10% off on steam at the moment, though when I put it in my cart it applied a 20% discount. I'm not sure what prerequisite I met to get the extra discount.
Edit: Rock Paper Shotgun also had some good things to say about it.