Slitherine

I am a steam user who had left steam for 3 years. And after I came back, I found I am very interesed in Check Your 6!

But I am so upset that I find I had missed it, why it coun't be bought on Steam or Slitherine anymore?

I don't know where could I buy it now? Does anyone (publisher or developer) still has its steam key which could sell to me?
I really like and want it.

I don't recommend to buy, there are bugs and frozen the game.

Yeah, actually I know that now.
But I still want to collect it for myself. So I want to know does anyone still have steam cdkeys remain to sell?
Or is there a physical version with a steam key?