As we mentioned, we intended to take the game off of the store to prepare for the full release in the next couple weeks. What we did not know is that Valve does not give developers the power to control availability themselves.
We have reached out where we can to find out how we go about removing the game from the store, so it could disappear at any time. Until then, you can still get the Deluxe Edition at the reduced Early Access price.
Sorry for the confusion, there are clearly things we are still learning about Steam.
Thanks for your understanding,
Question/TMC Team