Speaking of Slay the Spire, this seems like a decent more than StS inspired game. Not sure if it has as much variety but it does also give you a party of two that sets it apart a bit. Pretty fun so far. Only $1 with three starting classes and a few more classes available for $1 a piece.
Silent Abyss-fate of heroes by LiMing Chen
https://itunes.apple.com/us/app/silent-abyss-fate-of-heroes/id1447044513?mt=8
Silent Abyss-fate of heroes by LiMing Chen
https://itunes.apple.com/us/app/silent-abyss-fate-of-heroes/id1447044513?mt=8