This is insane, and any dev (and publisher) that still don't care about the Chinese (and other growing) market are missing a lot of potential sales.
Since last checking in, sales of Slay the Spire have risen to over 1.5 million and the game has seen some interesting growth in unexpected markets. In a talk given at GDC, Mega Crit announced that Slay the Spire has seen a sharp rise of interest in China, accounting for nearly half of all sales.
"The thing that's really important here is that China made up 43% of all sales(…) and this is before any localisation was available in the game, so there were a lot of confused players."
https://www.pcgamesn.com/slay-the-spire/slay-the-spire-salesThere's a lesson here to be learned about the need for localisation and translation in games to maximise their market potential. After all, figures revealed at GDC show that only 41% of Slay the Spire's player base is English-speaking.